Isaac Newton

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[[File:GodfreyKneller-IsaacNewton-1689.jpg|thumb|right|165px|Sir Isaac Newton sneaking a peek at Leibniz's derivative answers.]]
{{Physics|1}}{{Mathematics|1}}
{{cquote|I do not know what I may appear to the world. To myself, I seem to have been only like a boy, playing on the seashore, musing myself by now and then finding a smoother pebble, a prettier shell than ordinary, while the great ocean of truth lay all undiscovered before me.|||Isaac Newton<ref name="BBC"/>}}
'''Sir Isaac Newton''' (January 4th, 1642–March 31, 1727) was an [[England|English]] [[mathematics|mathematician]]<ref group=note>Out of all the mathematicians he knew, C.F. Gauss admired Newton the most. Some mathematicians in Gauss’ writings are referred to as ''clarissimus''—highly distinguished, yet only Newton is referred to as ''summus''—the very best.</ref> [[physics|physicist]], [[mystic]], [[alchemy|alchemist]] and [[philosophy|philosopher]].  Credited with revolutionary advances in classical mechanics, optics, and mathematics, he is rated as one of the most important and influential individuals in the history of science and mathematics.

==Master of the Enlightenment==
{{main|Age of Enlightenment}}
Isaac Newton clearly understood the importance of experiments in scientific research. For instance, Newton wrote the following in his ''Regulae Philosophandi'': Rule 4<ref group=note>This quote is from the Cohen and Whitman translation (see C&W 1999). Rule 4 was first ''published'' in the third edition of ''Principia''. But '''Rule 4''' ''appears'' earlier, in Newton’s copy of the second edition (''editio secunda'') of ''Principia'' (see Koyoré and Cohen 1972, p. 555).</ref> and '''comment''':<ref group=note>W.L. Harper notes that “Newton’s comment suggests that the point of this rule is to defend arguments based on induction from being undercut by mere hypotheses”</ref>
{{cquote|Rule 4: In experimental philosophy, propositions gathered from the phaenomena by [[induction]] should be considered either exactly or very nearly true notwithstanding any contrary hypotheses, until yet other phaenomena make such propositions either more accurate or liable to exceptions.<br />
Comment on Rule 4: This rule should be followed so that arguments based on induction may not be nullified by hypotheses.|||Newton, from the third edition of ''Principia''<ref> Newton, I., 1726. ''Philosophiae naturalis principia mathematica'' (''editio tertia'').<br />The original Latin: ''Regula'' IV: ''In philosophia experimentali, propositiones ex phenomenis per inductionem collectae, non obstantibus contrariis hypothesibus, pro veris aut accurate aut quamproxime haberi debent, donec alia occurrerint phaenomena, per quae aut accuratiores reddantur aut exectionibus obnoxiae''. </ref><ref name="Harper">Harper, W.L., 2011. ''Isaac Newton's scientific method: turning data into evidence about gravity and cosmology.'' Oxford University Press. p. 260.</ref><ref name="Densmore">Densmore Donahue W. ''Newton's Principia: The Central Argument''. Santa Fe, NM: Green Lion Press; 2003.</ref>}}
Newton’s characterisation of his methodology (in his Rule 4), as “experimental philosophy”, as distinguished from the mechanical philosophy of continental figures such as Descartes, is notable: Newton prioritised empirically establishing propositions as opposed to conjecturing hypotheses about causal mechanisms.<ref name="Harper"/>{{rp|260}}<br /> Moreover, Rule 4 emphasises the ''corrigibility'' &ndash; ''the acceptance subject to empirical correction'' &ndash; of scientific sentences in the face of recalcitrant experience: rather than viewing sentences as static, relying solely on the assignment and adjustment of sentence probabilities—as ''per'' certain approaches to inductive reasoning—Newton stresses that these sentences are to be “considered either exactly or very nearly true […] until yet other phaenomena make such propositions either more exact or liable to exceptions,” that the sentences themselves are to be conceived as the outcomes of measurement by phaenomena, hence the provision for making such propositions corrigible (capable of being “more exact” ''via'' correction) and fallible (capable of being “liable to exceptions” i.e., that may either confer some degree of disconfirmation or outright falsify said propositions).<ref name="Harper"/>{{rp|260-261}}

Indeed, he also gave a rather neat description of the [[scientific method]]:
{{cquote|The best and safest method of philosophizing seems to be, first to inquire diligently into the properties of things, and to establish those properties by experiences and then to proceed more slowly to [[hypotheses]] for the explanation of them. For hypotheses should be employed only in explaining the properties of things, but not assumed in determining them; unless so far as they may furnish experiments.|||Newton, [find Principia ref later]<ref>as quoted in Gribbin J. ''Science, A History: 1543-2001''. London: Allen Lane; 2002. </ref>}}<br />

[[File:Newtons_cradle_animation_book.gif|thumb|left|Newton's cradle is a device that demonstrates the conservation of momentum and energy.]]
Like many others who studied ''[[Natural philosophy|natural philosophy]]'', the old name for science before the modern disciplines developed, his interests were varied. His early mathematical investigations led to the generalized binomial theorem. While his predecessors and many of his contemporaries thought, following the footsteps of [[Aristotle]], a remarkable philosopher but a poor physicist, that heavenly bodies obeyed a different set of rules from those here on [[Earth]], Newton believed that the same set must be satisfied by both. In other words, the laws of physics must be ''universal''. This motivated his studies in mechanics. He had quite a bit of a brainstorm, writing down over a hundred postulates and definitions before settling down with just three axioms, now called Newton's laws of motion. The first law states that every body maintains the same speed and direction unless acted upon by an external net force. If there is a non-zero net force acting on the body, than that net force is equal to rate of change of a quantity of motion defined to be its [[Mass (physics)|mass]] times its velocity, <math>\textbf{p} := m \textbf{v} </math>. In the special case that the body has constant mass, we have the familiar expression <math>\textbf{F} = m\textbf{a}</math>. It is crucial to realize that forces are vectors, hence the bold font, quantities with both magnitude and direction. For every force applied, there exists another equal in magnitude and opposite in direction, provided the system is isolated; this is his third law of motion, from which springs the law of (linear) momentum conservation.<ref>Goldstein H, Poole C, Safko J. ''Classical Mechanics''. 3rd ed. New Delhi, India: Dorling Kindersley (India); 2011.</ref><ref>Giancoli D. Physics: Principles with Applications. 6<sup>th</sup> ed. Upper Saddle River, NJ: Pearson Education; 2005.</ref> There is, however, a bit of a problem. The mathematics available at the time was simply insufficient for further investigations in mechanics. Newton "simply" worked it out, calling it the "method of fluxions", known as calculus today.<ref name="Britannica">https://www.britannica.com/biography/Isaac-Newton</ref> Note, however, that the seeds of calculus have already been sowed by their predecessors, especially Archimedes of Syracuse. Newton and one of his contemporaries, Leibniz, are credited with the discovery of calculus in the sense that they recognize the fundamental importance of the concept of a limit and exploited the relationship between the geometric process of finding a tangent line to a curve at a point (differentiation) and the area bounded by a curve (integration), the Fundamental Theorem of Calculus, and developed this mathematical method in a systematic fashion. Unlike some of his contemporaries and successors who developed various techniques for integration, Newton tended to think of functions in terms of infinite series and integrated or differentiated them term-by-term.<ref group="note">If you are worried that the linearity of differentiation and integration does not apply to convergent infinite series, Cauchy later proved rigorously that this is in fact acceptable.</ref><ref name="Stewart">Stewart J. ''Calculus''. 7th ed. Belmont, CA: Thomson Brooks/Cole; 2012.</ref> Indeed, the use of the infinite series representation of a function automatically allows for an approximation scheme of arbitrary accuracy<ref group="note">This is most often done using Taylor's theorem (with the Lagrange remainder).</ref>

After some persuasion by his friend Edmond Halley, Newton published his ''Philosophiæ Naturalis Principia Mathematica'', thought to be one of the most influential scientific treatises of all time.<ref name="Reimer">Reimer L, Reimer W. ''Mathematicians are people, too: Stories from the Lives of Great Mathematicians''. Palo Alto, CA: Dale Seymour Publications; 1990.</ref> It was in this book that he laid down the foundations for calculus, classical mechanics, and his theory of [[gravity]]. He demonstrated that an object's force of gravity weakens as the reciprocal of square of the distance from it (an inverse-square law) and derived Kepler's laws of orbital motion, which were previously obtained from extensive empirical data collected by [[Tycho Brahe]]'s painstaking astronomical observations.<ref name="Gribbin"/> Strictly speaking, Newton's law of universal gravitation applies only to point masses, not extended bodies such as the Earth.<ref group="note">In order to derive the gravitational field an extended body, one must add up the fields of all the individual points making up that body. This is where integral calculus comes in.</ref> In addition, one wonders what happens when the distance shrinks to zero; it is clear that the force cannot be infinite. Fortunately, Newton showed that a spherically symmetric body can be treated as if all of its mass was concentrated at its center. This means that when the mutual force of gravity between the Earth and the [[Sun]], say, is calculated, the distance in question is that between their centers. Furthermore, inside a spherically symmetric shell, the force vanishes.<ref name="Densmore"/><ref group="note">Newton's shell theorem also holds in electrostatics.</ref> Since a ball consists of a stack of concentric spheres, the force at its center is precisely zero. He gave a theory of tides using his newfound understanding of gravitational physics. In an ingenious calculation, Newton showed that the Earth is not exactly spherically symmetric, but had an equatorial bulge due to its rotation about an axis.<ref name="Hand"/> But since this oblateness is very small, the Earth remains a ball to a very good approximation. It is interesting to note that even though the first lemmas contain the core ideas behind calculus, his subsequent development of mechanics uses only Euclidean geometry.<ref name="Gribbin"/><ref name="Densmore"/> At the time, calculus remained a controversial topic and Newton simply detested controversy. We do not know whether he obtained his results using calculus first then confirmed them using older mathematics or did so the other way around. Either way, this is a phenomenal achievement,<ref name="Gribbin">Gribbin J. ''Science, A History: 1543-2001''. London: Allen Lane; 2002.</ref> demonstrating that his geometric ingenuity was on the same level as that of Archimedes. He did, however, provide an account of his work on calculus in a separate publication.<ref name="Britannica"/>

While Johannes Kepler was the first to suggest that a physical force rather than some occult influence is responsible for orbital motion<ref name="Gribbin"/>, physical cosmology arguably began with Isaac Newton. Newton's law of universal gravitation enables the determination of the motion of heavenly bodies. But he went further than that. Newton suggested that since comets occasionally hit the Sun, perhaps the Earth was originated from the hot debris scattered into space from such a collision, then pulled together by means of gravitational attraction. This means the Earth started out extremely hot, and that this information could be used to determine [[Age of the Earth|how old Earth is]]. He himself estimated that it must be older than 50,000 years.<ref name="Gribbin"/> In light of the fact that he is credited with Newton's law of cooling (or heating), which states that the rate of change of temperature of a body with respect to time is directly proportional to the difference between the instantaneous temperature of that body and the ambient temperature, assuming the latter is kept constant,<ref name="Stewart"/> this does not come at a surprise.

[[File:Newton's_rings_(650nm_red_laser_light).jpeg|thumb|left|Newton's rings generated using 650nm red laser light.]]
Newton held a keen interest in [[light]]. He produced a well-received paper on the theory of colors and built a new and compact telescope which eliminated the unwanted color patterns on the fringe. He gave a description of Newton's rings. His famous prism experiment revealed that white light could be decomposed into various colors, which, if refocused, produce white light once again. He performed a variation on the experiment to test the nature of light. The current idea at the time was that the colors were made by white light being bent, so he contrived a way to pass a red beam of light onto another prism, to see if it would be bent into another spectrum of new colors. The result was light of uniform and undifferentiated red, proving that white light was composed of all the colors. Once again, this flew in the face of common wisdom at the time, when most people thought that white light was a symbol of purity, or even of divine power.<ref name="BBC"/> In his monograph ''Opticks'', Newton elaborated his corpuscular theory of light and explained pretty much all that was already known about light. Some of his contemporaries, such as Robert Hooke and Christian Huygens, preferred the wave theory. However, at this time no one could really tell if light behaved as a stream of particles or as traveling waves.<ref name="Gribbin"/> During his investigations in optics and vision, Newton performed a number of alarming experiments on himself, risking the loss of his vision. He [[Sungazing|stared directly at the Sun]] for some time and poked the back of his eye with a bodkin (a fat, blunt needle) to study the resulting colored patterns he saw.<ref name="BBC"/>

A true mathematical genius, in 1669 Newton was elected as the second Lucasian Professor of Mathematics at Cambridge, a post that would later be held by [[Paul Dirac]] and [[Stephen Hawking]]. Indeed, he is often considered to be one of the greatest mathematicians in history, alongside Archimedes and Karl Friedrich Gauss.<ref name="Reimer"/> In the early 1700s, Newton, Leibniz, Johann Bernoulli, Jacob Bernoulli, and Guillaume de L'Hôpital independently solved the brachistochrone problem, first stated by Johann Bernoulli. It asks for the curve between two points on a plane on which a particle will slide frictionlessly from one point to the other in the least possible time, assuming gravity is uniform. The solution is not a straight line but a cycloid. Newton received a letter detailing the problem on his way home from the Royal Mint, and sent the solution anonymously back to Bernoulli the next day. However, when Bernoulli read the letter, he immediately recognized its author, reportedly exclaiming, "I know the Lion from his paw!" The brachistochrone problem is a classic in the calculus of variations, which plays an inordinately important role in the further developments of (theoretical) physics. Newton did some work on this subject, but again, did not publish.<ref name="Hand">Hand L, Finch J. ''Analytical Mechanics''. Cambridge: Cambridge University Press; 1998.</ref>

==Misadventures in alchemy and theology==
{{cquote|Newton was not the first in the Age of Reason. He was the last of the magicians.|||John Maynard Keynes, as quoted in <ref name="BBC"/>}}
As was common at the time, Newton also devoted much time to [[bible|biblical]] scholarship, [[alchemy]] and other [[theology|theological]] questions.  Newton was a reclusive man and no accounts of him being in any kind of relationship exists, leading to suggestions that he was [[Asexuality|asexual]], or possibly [[gay]].<ref>[http://www.stcatharinesstandard.ca/ArticleDisplay.aspx?e=1141656&archive=true St. Catharine Standard: Examining the non-sexual]</ref><ref>[http://www.newtonproject.sussex.ac.uk/prism.php?id=40 ''Isaac Newton's Personal Life''], from Sussex University's ''The Newton Project''.</ref> There is, however, no credible evidence supporting either claim.<ref name="Gribbin"/> He was also [[Arianism|Arian]] in his religious beliefs.  He stood up to James II's attempt to appoint a [[Roman Catholic Church|Roman Catholic]] [[monk]] named Alban Francis to an academic post at Cambridge and the appointment was stopped.  In his popular book ''A Brief History of Time'', [[Stephen Hawking]] has criticized Newton for this as an example of religious intolerance.  However it is to be borne in mind that the [[Roman Catholic Church]] had burnt [[Giordano Bruno]] for [[heresy]], mostly on account of his Arianism (i.e., the belief that [[Jesus Christ]] was of similar not same substance to and created by [[God]].) and that this appointment was the thin end of the wedge, leading to similar persecution that had stifled scientific inquiry in Catholic countries after [[Galileo Galilei|Galileo]]. In his own lifetime, Newton wrote more on religion than he did on natural science. Worse still, Newton at least once made an argument involving divine powers in his scientific work. It appeared to Newton that the [[Solar System]] is unstable, and he thought that every 200 years or so, [[Goddidit|God would have to intervene]] by putting the planets back in their place. Fortunately, the 'God hypothesis' turned out to be unnecessary. Pierre-Simon de Laplace demonstrated that to first order, the Solar System is indeed stable; the mean motion of all bodies remain invariant with time.<ref name="James"/>

Unfortunately, for all his marvelous achievements Newton's life was mixed in with some frightening bouts of near [[insanity]]. [[John Maynard Keynes]] described Newton as not the first of the [[rationalist]]s, but rather the "last of the [[magic]]ians" due to his obsession with alchemy. "In modern vulgar terms," Keynes said, "Newton was profoundly neurotic."<ref name="BBC">BBC Documentary: Isaac Newton, the Last Magician ([http://www.dailymotion.com/video/x1wjy2r_isaac-newton-the-last-magician-s01e01-480p-hdtv-x264-msd_creation DailyMotion link])</ref> Indeed, discovering the nature of optics was probably a side effect of trying to turn [[lead]] into [[gold]]. Later in his life, he suffered a nervous breakdown, which might have been caused by [[mercury]] poisoning, overwork, and the end of his friendship with the Swiss mathematician Nicholas Fatio de Duillier.<ref name="James">James I. ''Remarkable Physicists''. Cambridge, U.K.: Cambridge University Press; 2004. </ref><ref name="Gribbin"/>

==Master of the Royal Mint==
Newton's research career was interrupted by a spell in [[politics]], in which the most notable period was his appointment as Master of the Royal Mint. This lucrative post turned him into a wealthy man. (It was also during this period that Newton received and solved the brachistochrone problem.) His obsession with detail meant that under him, the institution operated more effectively than it had ever before. Newton conducted a careful study of the history and methods of counterfeiting. He also operated a network of paid informants and sent money to friendly witnesses who were short on funds so that they could dress nicely for court appearances. In the end, Newton saw to it that multiple counterfeiters were hanged.<ref>Iliffe R. Newton: A Very Short Introduction. Oxford: Oxford University Press; 2007. </ref>

==Disputes and criticisms==
{{cquote| If I have seen farther, it is by standing on the shoulders of Giants.<ref>[https://digitallibrary.hsp.org/index.php/Detail/objects/9792 Isaac Newton letter to Robert Hooke, 1675] ''Historical Society of Pennsylvania''.</ref>}}

This famous quote is typically interpreted as a gesture of modesty by the great scientist in a letter to his colleague [[Robert Hooke]]. There is, however, an alternative approach that better matches Newton's personality, which was famously unpleasant toward those who angered him. It did not help that some of his colleagues and potential collaborators got into disputes with him. Now, the standards of grammar (and spelling) back then was rather strange. But Newton's decision to capitalize the word "Giants" was probably a dig at Hooke, who was short and had a twisted back. Robert Hooke, known for his work in microscopy, optics and elasticity, was responsible for getting the Royal Society up and running. In a discussion involving Hooke, Edmond Halley and Christopher Wren, the three concluded that an inverse square law of gravity would give rise to elliptical orbits (Kepler's first law), but none of them could give a mathematical demonstration. Newton did. Not only that, he systematically worked out the rest of Kepler's laws. When Hooke died, Newton succeeded him and transformed it onto a respectable scientific institution. However, under Newton, a man obsessed with details, the only portrait of Hooke was lost.<ref name="Gribbin"/>

It is quite unfortunate that Newton got into a very bitter and prolonged dispute with [[Gottfried Wilhelm Leibniz]] over who discovered calculus first. We now know that they both did so independently. Newton got there first but published later while Leibniz got there later but published first. We also know that the two corresponded respectfully before the dispute. Newton explained how he came up with the generalized binomial theorem to Leibniz back in the 1660s.<ref name="Stewart"/> Leibniz's notations for the derivative <math> \frac{dy}{dx}</math> and integral <math> \int y dx </math> remain in use today even though they seem to be somewhat illogical.<ref name="James"/> Newton's dot notation for the derivative is mainly used in physics to represent how something changes with respect to time. In some cases, it is advantageous to use both of their notations.

Since the publication of Newton's ''Opticks'', almost all physicists and mathematicians adhered to his corpuscular theory of light, which is respectable in its own right. However, the minority who preferred the wave theory were needlessly marginalized and criticized, all because of [[Argument from authority|Newton's mighty name]].<ref name="Gribbin"/> Moreover, Newton gave a tentative derivation of Boyle's law in the ''Principia'', in which he assumed that a gas consists of static atoms of negligible sizes compared that its volume that repelled each other via a force that weakened as the inverse of the distances between them. ''Tentative'' is the key word here. Newton merely suggested a hypothesis that might theoretically explain Boyle's law. Again, physicists for many years ignored the alternative approach pioneered by Daniel Bernoulli, which also yielded Boyle's law. Like Newton, Bernoulli assumed that gases consisted atoms of tiny dimensions. Unlike Newton, he conceived them as moving about randomly, colliding elastically with each other and with the walls of the container, which gives rise to pressure. Only much later, when physicists realized that [[Thermodynamics|heat is a kind of motion]] did they become interested in Bernoulli's approach. This became the basis for the kinetic molecular theory of gases.<ref name="Lewis">Lewis J. ''Heat and Thermodynamics: A Historical Perspective''. Westport, CT: Greenwood Press; 2007</ref><ref group="note">By taking a detour, first obtaining the Boltzmann factor, of fundamental importance in statistical mechanics, from purely probabilistic considerations, then proving the equipartition theorem before returning to Bernoulli's derivation, one obtains the famous ideal gas law <math>PV = N k_{B} T </math>.</ref> This is not really a criticism against Newton himself, but rather of the physicists who took his words uncritically. In the case of the corpuscular theory of light, it was rather fitting that a sophisticated theory of diffraction, formulated by Augustin Fresnel based on the wave theory, was experimentally verified by François Arago, who tested the predictions extracted by Simeon-Denis Poisson, when both Arago and Poisson were declared supporters of the corpuscular theory.<ref name="Gribbin"/><ref group="note">This is where the Poisson spot came from.</ref> However, at the start of the 1800s, physicists recognized that Newton's law of cooling (or heating) faltered when more precise measurements were made. This sparked the experimental studies of the behavior of gases. These proved crucial in the development of thermodynamics. Along the way, physicists stumbled upon the rule of Dulong and Petit, which favors the atomic hypothesis.<ref name="Lewis"/> Questioning authority, that is, to really stand upon the shoulders of giants rather than in their shadows, turned out to be a great idea.

For seventeen years, Newton lectured to an essentially empty hall at Cambridge. He eventually gave up teaching.<ref name="James"/> Given the fact that his reputation was enormous even in his own lifetime, one can scarcely avoid the conclusion that Newton was an abstruse professor.

==Myths==
A popular myth associated with Newton is that he was born on the same day [[Galileo]] died. As a matter of fact, Newton was born on January 4 1642, in the Gregorian calendar, first introduced in various countries in the Continent and is the one we use today, and on December 25, 1641, in the Julian calendar, used in England at the time while Galileo died on January 8 1642 in the Gregorian calendar and December 31, 1641 in the Julian calendar.<ref group="note">If you want to, you can use this information to mark the beginning and end of your Winter holidays.</ref> However, it is a genuine coincidence that Newton was born exactly a century after [[Copernicus]] published his [[heliocentric theory]].<ref name="Gribbin"/>

Another well-publicized myth is that Newton came up with the inverse-square law of gravity after an apple fell and hit him on the head. Even though Newton himself mentioned this in his ''magnum opus'', it is in all probability a just a motivating passage. The actual process of discovery took much longer than this. The idea did not come to him out of the blue but gradually. Indeed, it took him quite a bit of work before he was able to give the mathematical proof that eluded Hooke, Wren, and Halley.<ref name="Gribbin"/>

Rumor has it that Newton invented the pet door, but this does not seem to be the case.<ref>http://www.livescience.com/20296-isaac-newton.html</ref> However, he was a talented mechanical inventor, like Hooke. When he was a child he constructed flying machines that carried candles, thereby creating some early episodes of [[UFO|UFO scares]].<ref name="Reimer"/><ref name="Gribbin"/> He also built a clock that ran using water power and a miniature mill that grinds wheat operated by a mouse turning the wheel.<ref name="Reimer"/>

Much like [[Albert_Einstein|Einstein]], [[Nikola_Tesla|Tesla]], [[Charles_Darwin|Darwin]], Mozart, [[Bill Gates]] and [[Steve_Jobs|Steve Jobs]], Newton has been postulated as having {{wpl|Autism|autistic developmental disorder}} by a great many [[Aspie_supremacy|cranks]].<ref>https://www.appliedbehavioranalysisprograms.com/historys-30-most-inspiring-people-on-the-autism-spectrum/</ref> In his case, the diagnosis was conveniently conducted post-mortem, in a fashion reminiscent of how [[Mormonism|some sects claim the dead as their own]]. [[Psychology|Psychologist]] Simon Baron-Cohen has been the only half-serious researcher to entertain this [[Falsifiability|not-quite-falsifiable]] hypothesis, for which he has been [[BDSM|spanked]] by his peers.<ref>https://www.newscientist.com/article/dn3676-einstein-and-newton-showed-signs-of-autism/</ref>

==Famous quotes==

{{cquote|I do not define time, space, place, and motion, as being well known to all.}}
{{cquote|We are to admit no more causes of natural things than such as are both true and sufficient to explain their appearances.}}
{{cquote|I feign no hypotheses.}}

==See also==
{{div col}}
*[[Aristarchus of Samos|Aristarchus]]
*[[Nicolaus Copernicus|Nicolaus Copernicus]]
*[[Johannes Kepler|Johannes Kepler]]
*[[Galileo Galilei|Galileo Galilei]]
*[[Albert Einstein]]
*[[Gravity]]
*[[Physics]]
*[[Multiple discovery]]
{{div col end}}

==External links==
*Works of Isaac Newton in [[wikisource:la:Scriptor:Isaacus Newtonus|Latin]] and  [[wikisource:en:Author:Isaac Newton|English]] on Wikisource

==Notes==
{{reflist|group=note|2|90%}}

==References==
{{reflist|2|90%}}

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