Surveying
The angle between the plane of the equator and the plane of the ecliptic, is known as obliquity of the ecliptic and its value is

22° 30'
23° 30'
23° 27'
24° 0'

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Surveying
Sidereal day

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

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