In astronomy, there are three ways to define a day for a planet
∠Mean solar day
http://10moresocks.com/upload/products/_20131028001714919.jpg
∠Sidereal day
http://10moresocks.com/upload/products/1_20131027232529233.jpg
∠Rotation period
http://10moresocks.com/upload/products/1_20131027232529512.jpg
Length：16cm
Sole：24～26cm
70%cotton + 5%nylon + 25%sp
▲Handwash at 30°C
▲Do not tumble dry
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