Surveying
The declination and right ascension of the sun becomes 23° 27' N and 90° respectively on

June 21
December 22
September 21
March 21

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Surveying
Sidereal day

All listed here
Is divided into the conventional hours, minutes and seconds
Is the period of time taken by the earth in making a complete rotation with reference to stars
Is slightly shorter than an ordinary solar day

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