Question: What is the period of revolution of the planet that seems to buck the gravitational laws of the person responsible for observations in the spectrum in Earth years?

<P0-S0> some of the earliest recorded observations ever made through a telescope, galileo's drawings on 28 december 1612 and 27 january 1613 contain plotted points that match up with what is now known to be the position of neptune. <P0-S1> on both occasions, galileo seems to have mistaken neptune for a fixed star when it appeared close—in conjunction—to jupiter in the night sky; hence, he is not credited with neptune's discovery. <P0-S2> at his first observation in december 1612, neptune was almost stationary in the sky because it had just turned retrograde that day. <P0-S3> this apparent backward motion is created when earth's orbit takes it past an outer planet. <P0-S4> because neptune was only beginning its yearly retrograde cycle, the motion of the planet was far too slight to be detected with galileo's small telescope. <P0-S5> in july 2009, university of melbourne physicist david jamieson announced new evidence suggesting that galileo was at least aware that the "star" he had observed had moved relative to the fixed stars.in 1821, alexis bouvard published astronomical tables of the orbit of neptune's neighbour uranus. <P0-S6> subsequent observations revealed substantial deviations from the tables, leading bouvard to hypothesise that an unknown body was perturbing the orbit through gravitational interaction. <P0-S7> in 1843, john couch adams began work on the orbit of uranus using the data he had. <P0-S8> via cambridge observatory director james challis, he requested extra data from sir george airy, the astronomer royal, who supplied it in february 1844. adams continued to work in 1845–46 and produced several different estimates of a new planet. <SEP> <P1-S0> Mercury is the smallest and innermost planet in the Solar System. <P1-S1> Its orbital period around the Sun of 88 days is the shortest of all the planets in the Solar System. <P1-S2> It is named after the Roman deity Mercury, the messenger to the gods. <SEP> <P2-S0> His work on light was collected in his highly influential book Opticks, published in 1704. <P2-S1> He also formulated an empirical law of cooling, made the first theoretical calculation of the speed of sound, and introduced the notion of a Newtonian fluid. <P2-S2> In addition to his work on calculus, as a mathematician Newton contributed to the study of power series, generalised the binomial theorem to non-integer exponents, developed a method for approximating the roots of a function, and classified most of the cubic plane curves. <P2-S3> Newton built the first practical reflecting telescope and developed a sophisticated theory of colour based on the observation that a prism separates white light into the colours of the visible spectrum. <SEP> <P3-S0> Some astrophysicists predicted the existence of another planet (Vulcan) that would explain the discrepancies; however, despite some early indications, no such planet could be found. <P3-S1> When Albert Einstein formulated his theory of general relativity (GR) he turned his attention to the problem of Mercury's orbit and found that his theory added a correction, which could account for the discrepancy. <P3-S2> It was only the orbit of the planet Mercury that Newton's Law of Gravitation seemed not to fully explain. <P3-S3> This was the first time that Newton's Theory of Gravity had been shown to be less correct than an alternative. <SEP> <P4-S0> observations of sunspots were recorded during the han dynasty (206 bc–ad 220) by chinese astronomers, who maintained records of these observations for centuries. <P4-S1> averroes also provided a description of sunspots in the 12th century. <P4-S2> the invention of the telescope in the early 17th century permitted detailed observations of sunspots by thomas harriot, galileo galilei and other astronomers. <P4-S3> galileo posited that sunspots were on the surface of the sun rather than small objects passing between earth and the sun.arabic astronomical contributions include albatenius' discovery that the direction of the sun's apogee (the place in the sun's orbit against the fixed stars where it seems to be moving slowest) is changing. <P4-S4> (in modern heliocentric terms, this is caused by a gradual motion of the aphelion of the earth's orbit). <P4-S5> ibn yunus observed more than 10,000 entries for the sun's position for many years using a large astrolabe.