What was the Greenwich sidereal time in radians on 3 June 1970 at 17h 00m and 00s UT? What is the remainder over an integer number of revolutions?

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What was the Greenwich sidereal time in radians on 3 June 1970 at 17h 00m and 00s UT?  What is the remainder over an integer number of revolutions?  I know the answer is 970.171487 radians but I do not know how to get there.

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