One of the planets, the second in order from the sun, its
   orbit lying between that of Mercury and that of the Earth, at a mean
   distance from the sun of about 67,000,000 miles. Its diameter is 7,700
   miles, and its sidereal period 224.7 days. As the morning star, it was
   called by the ancients Lucifer; as the evening star, Hesperus.