Alhidade

The Alhidade is the part of a theodolite that rotates around the vertical axis, and that bears the horizontal axis around which the telescope (or visor, in early telescope-less instruments) turns up or down.

In a sextant the alhidade is the turnable arm carrying a mirror and an index to a graduated circle.

Arabic: al-idhâdah = "ruler"

de:Alhidade

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