Venus orbits the sun in a nearly circular orbit, with an average distance of 654.38+0.075 million kilometers from the sun. From the point of view that the earth and Venus orbit the sun together, Venus also shows a phase change similar to that of the moon. It takes 225 Earth days for Venus to make a revolution, but it takes 584 days to go through a phase period. Venus has a longer rotation period than period of revolution, which is unique among the nine planets. Venus has a rotation period of 243 days. The day and night of Venus are about 59 days each, that is to say, the last day and night on Venus is equivalent to 1 17 days on the earth. During the conjunction (that is, Venus lies between the earth and the sun), it is closer to the earth than other planets, within 42 million kilometers. Sometimes Venus will pass through the round surface of the sun when approaching, which is called transit of venus. Transit of venus is a rare astronomical phenomenon, which has been used to determine the exact value of astronomical units.
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