Surveying
The main object of the astronomer to obtain

All of these
Astronomical bearing
Astronomical longitude
Astronomical latitude

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Surveying
Systematic errors

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

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Surveying
For a line AB

the forebearing of AB and back bearing of BA differ by 180°
both (A) and (B) are correct
the forebearing of AB and back bearing of AB differ by 180°
none is correct

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