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| View Original: | Venus geocentric orbit curve simplified (pentagram).svg (604x600) | |||
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| Keywords: Venus geocentric orbit curve simplified (pentagram).svg A simplified plot of the position of Venus with respect to the Earth i e geocentric perspective For this graphic Venus and the Earth are assumed to be in coplanar concentric perfect circular orbits around the sun with Venus' orbit having a radius of 0 724 AU and Venus' and Earth's orbital periods are assumed to be in an exact 8 13 ratio The position of Venus with respect to the Earth is plotted approximately every 13 and a half hours over the 8 year period a total of 5 200 points The resulting 5-fold symmetric curve is sometimes called a pentagram though it has little resemblance to a conventional 5-pointed star The innermost loops near the center are where Apparent retrograde motion is observed See File Venus pentagram png for an alternative more astronomically-correct less simplified plot The SVG was generated by means of the following self-written vector PostScript source code <pre> 306 396 translate 0 1 5200 36 mul dup 65 div/e exch def 40 div/v exch def 170 e sin mul 123 08 v sin mul sub -170 e cos mul -123 08 v cos mul sub 1 6 0 360 arc closepath fill for showpage EOF</pre> 2012 AnonMoos Venus planet Astronomical diagrams 5-fold rotational symmetry Images with PostScript source code | ||||
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