Surveying
The nautical mile is the length of

1 minute of latitude
1 degree of latitude
1 degree of longitude
1 minute of longitude

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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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