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

9 h 00 m
7 h 30 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
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
All listed here

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Surveying
The length of a chain is measured from

outside of one handle to outside of other handle
outside of one handle to inside of other handle
inside of one handle to inside of other handle
centre of one handle to centre of other handle

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