Surveying
A telescope is said to be inverted if its

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

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Surveying
Circumpolar stars

Remain always above the horizon
Rotate round the celestial pole
Are seldom seen near the pole star
Rotate round the North Pole

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