Surveying
The position of the sun when its north declination is maximum is known as

Vernal equinox
Autumnal equinox
Winter solstice
Summer solstice

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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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