Planet_Elongation.jpg - Wikipedia

Summary

Description Planet Elongation.jpg	English: Caption from source: "Because Mercury and Venus orbit the Sun within Earth's orbit, they stay close to the Sun in the sky as seen from Earth. At their greatest angular distance from the Sun they are said to be at elongation. Here the two planets are shown at eastern elongation; they set after the Sun and appear as evening stars."
Source	http://history.nasa.gov/SP-424/ch1.htm
Author	NASA

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