Surveying
With standard meridian as 82° 30' E the standard time at longitude 90° E is 8 h 30 m. The local mean time at the place will be

7 h 30 m
9 h 00 m
7 h 00 m
8 h 00 m

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Surveying
Sidereal day

Is divided into the conventional hours, minutes and seconds
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

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