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Altacimutal It is one of the systems used to establish the position of an object in the celestial sphere.

This coordinate system describes the position of an object with respect to the local visible horizon. Points below the horizon have negative heights. The height is sometimes called elevation. The altacimuth is the angle measured from the north clockwise.

The altacimuthal coordinates of an object are local coordinates, and they change constantly over time.

This name is also given a specific type of support for optical instruments, which allows the telescope tube to be moved in any direction.

Olaus Roemer (1644-1710), a Danish astronomer born in Århus, invented the altacimutal and the equatorial telescope. He mounted his inventions in his observatory around Copenhagen.

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