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When was the precession of Mercury's orbit first noticed?
{{quotebox|Mercury has a very elliptical orbit. At its farthest distance from the Sun, it is nearly 50% farther than at its nearest distance to the Sun. <ref> [http://astroprofspage.com/archives/139 ] </ref> }}
{{quotebox|Mercury has a very elliptical orbit. At its farthest distance from the Sun, it is nearly 50% farther than at its nearest distance to the Sun. <ref> [http://astroprofspage.com/archives/139 ] </ref> }}
The [[precession]] of Mercury's eccentric orbit was detectable to 19th century astronomers.{{fact}}
Mercury is one of the five brightest planets, and has been known since ancient times.
Mercury is one of the five brightest planets, and has been known since ancient times.