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'
24° 0'
23° 30'
23° 27'

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Surveying
Systematic errors

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

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