[DOC] [TLE] 72 - Galileo's Observations of Neptune, Editors Bit (Grand Canyon ... [PAR] Galileo couldn't possibly have observed Neptune, could he? ... be seen in the 
skies, making regular notes and sketches of his observations. ... It is rewarding to 
consider just exactly why Galileo didn't add the discovery of a completely new 
planet ... enough to show a disc for either Uranus or Neptune (although he might 
have... [DOC] [TLE] Science A-17 Lecture Notes - HUIT Sites Hosting - Harvard University [PAR] Some of the notes have been revised to reflect the way the lectures were given ... 
A solar year might be defined as the time it takes for the Sun to get back to the .... 
He promoted the Pythagorean ideal that only uniform motion in circles could be 
..... Just as the most distant planet, Saturn, shows a small retrograde loop as the... [DOC] [TLE] Open Course : Astronomy : Introduction : Lecture 5 : Motion of the ... [PAR] Oct 22, 2002 ... With the naked eye, one can see five planets: Mercury, Venus, Mars, Jupiter, and 
Saturn. ... The planets move slowly enough that their positions change only ... be 
more useful than the other for a particular purpose, as we have seen. ... and 
found that he could describe the planets' observed motions to an... [DOC] [TLE] Astronomy Timeline [PAR] Given the thickness of the rocks, he concluded that the Earth is ancient. ... His 
estimate may have been accurate to within a few percent. p. .... 1609. Galileo 
uses telescope for astronomical observations. Galileo didn't ... He carried out 
important observations of the Sun, Moon, Planets, and Stars. p. 51 ..... Notes, (
What is this?) [DOC] [TLE] The Ninth Planet That Wasn't  NOVA Next | PBS [PAR] Jan 26, 2016 ... It was 1859, and Le Verrier, a giant of French astronomy, was attempting to .... 
Instead, he thought not about the planet in transit, but whether there might be 
other ... He has just missed its first appearance at the edge of the sun. ... which 
enabled him to recognize the conditions of the existence of Neptune. [DOC] [TLE] Astronomy in the 17th century - Cosmic Elk [PAR] They could not have seen the sun spots without this form of projection of the ... 
Pictures from the middle ages show astronomers apparently looking through 
telescopes. ... He did not find out about the Dutch spyglass until he was in Venice 
in 1609 a ... the appearances of planets which showed discs, and stars which 
didn't... [DOC] [TLE] Galileo Galilei - Wikipedia [PAR] Galileo Galilei was an Italian astronomer, physicist, engineer, philosopher, and 
mathematician ... He met with opposition from astronomers, who doubted 
heliocentrism ... These financial burdens may have contributed to Galileo's early 
fire to .... based on his astronomical observations of 1609 (Sidereus Nuncius 
1610). [DOC] [TLE] Deferent and epicycle - Wikipedia [PAR] In the Hipparchian and Ptolemaic systems of astronomy, the epicycle was a 
geometric model used to explain the variations in speed and direction of the 
apparent motion of the Moon, Sun, and planets. In particular it explained the 
apparent retrograde motion of the five planets ... He generally ordered the 
planets outward from the Earth based on their orbit... [DOC] [TLE] Why did it take so long to discover Uranus? :: NASA Space Place [PAR] People may have seen Uranus as early as 128 B.C. but, each time they saw it, 
they ... Sure, he knew it wasn't a star, but he didn't think it was a planet either. On 
March 13, 1781, William Herschelan amateur astronomerlocated an ... They 
figured out that its orbit was pretty close to circularjust like the orbit of a planet. [DOC] [TLE] Planetary Science--A Space Odyssey | Science [PAR] In 1609, he quickly grasped the scientific value of a new military technology: the 
telescope (at first a ... The first epoch of discovery didn't stop with Newton. [DOC] [TLE] Our Expanding Solar System: Planets and Moons - Springer [PAR] naked eye planets of Mercury, Venus, Mars,

Question: This astronomer's notes show he may have seen Neptune in 1609; he just didn't recognize it as a planet
Answer: Galileo