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

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

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Surveying
Systematic errors

Always follow some definite mathematical law
Can be removed by applying corrections to the observed values
All listed here
Are also known as cumulative errors

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