Surveying
The hour angle of the heavenly body for Greenwich meridian equals the hour angle of the body for any other meridian + longitude:

All listed here
True sun
Vernal equinox
Mean sun

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Surveying
Systematic errors

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

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Surveying
Which of the following errors is not eliminated by the method of repetition of horizontal angle measurement ?

error due to wrong adjustment of line of collimation and trunnion axis
error due to displacement of station signals
error due to eccentricity of verniers
error due to inaccurate graduation

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Surveying
Normal tension is that pull which

neutralizes the effect due to pull and sag
is used at the time of standardising the tape
makes the correction due to sag equal to zero
makes the correction due to pull equal to zero

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