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An alidade (/ˈæ.lɪ.deɪd/) (archaic forms include alhidade, alhidad, alidad) or a turning board is a device that allows one to sight a distant object and use the line of sight to perform a task. This task can be, for example, to triangulate a scale map on site using a plane table drawing of intersecting lines in the direction of the object from two or more points or to measure the angle and horizontal distance to the object from some reference point Polar measurement. Angles measured can be horizontal, vertical or in any chosen plane. The alidade sighting ruler was originally a part of many types of scientific and astronomical instrument. At one time, some alidades, particularly using circular graduations as on astrolabes, were also called diopters. With modern technology, the name is applied to complete instruments such as the plane table alidade.
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Albums by AlidadeSort:By AlbumA - Z
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| Song | Duration |
|---|---|
| Median | 2:15 |
| Blood and Otherwise | 3:04 |
| Origin Story | 2:22 |
| Love, Among Other Things | 3:08 |
| Crook Point Bridge (I Watched It Burn) | 5:00 |
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