Surveying
The length of a parallel of λ latitude between two meridians is equal to difference in longitudes multiplied by

cos λ
sin λ
tan λ
cot λ

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Surveying
A telescope is said to be inverted if its

vertical circle is to its right and the bubble of the telescope is down
vertical circle is to its right and the bubble of the telescope is up
vertical circle is to its left and the bubble of the telescope is up
vertical circle is to its left and the bubble of the telescope is down

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