Word of the day

Alftazimuth – a telescope mounting that moves in azimuth (about a vertical axis) and in altitude (about a horizontal axis; an instrument for establishing the altitude and asimuth of the stars and planets; the coordinate system in which a celestial object’s position is described in terms of its altitude and azimuth; a surveying instrument for measuring vertical and horizontal angles, resembling a theodolite but larger and more precise.

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