Antique astronomical theodolite
Theodolites are measuring instruments designed based on the principle of angle measurement to measure horizontal and vertical angles. They are divided into two types: optical theodolites and electronic theodolites, with the most commonly used being electronic theodolites. The theodolite is the mechanical part of a telescope that allows it to point in different directions. The theodolite has two mutually perpendicular axes to adjust the azimuth and horizontal height of the telescope. A theodolite is a type of angle measuring instrument equipped with a sighting section, a horizontal dial and reading indicators, and a vertical dial and reading indicators.
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