length of sidereal day
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length of sidereal day
length of sidereal year
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length of sidereal day, length of sidereal year, sidereal day length in seconds, sidereal year length in days, how long is earth's sidereal day, what is sidereal year's length, what are sidereal days, hours in a sidereal day, how many days in a sidereal year, how many seconds in a sidereal day, sidereal year in days, how long is a sidereal year, sidereal day in seconds, how long is the sidereal period
