Mercury

Venus Mars Part I Lecture 20 Observing Mercury and Venus from Earth Elongations of Mercury Mercury moves around the Sun every 88 days in a rather eccentric orbit As seen from the Earth the angle between Mercury and the Sun at greatest eastern or western elongation can be as large as 28 when Mercury is near aphelion or as small as 18 near perihelion By contrast Venus follows a larger nearly circular orbit with a 2247day period The angle between Venus and the Sun at eastern or western elongation is 47

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