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

True sun
Vernal equinox
Mean sun
All listed here

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Surveying
Normal tension is that pull which

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
neutralizes the effect due to pull and sag

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Surveying
The cross hairs in the surveying telescope are placed

midway between eye piece and objec-tive lens
much closer to the eye-piece than to the objective lens
much closer to the objective lens than to the eye piece
anywhere between eye-piece and objective lens

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