Ancient astronomical instruments.

Ancient astronomical instruments.

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Caption: A display of historical Chinese astronomical instruments on the roof of the Beijing Ancient Observatory in Beijing, China, an astronomical observatory that dates from the 1400s. From left to right: azimuth theodolite (1715) to determine azimuth and altitude (elevation angle) of celestial objects; altazimuth (1673) to determine the azimuth of celestial objects; ecliptic armilla (1673) to measure ecliptic longitude difference and latitude of celestial objects.

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Keywords: 1400, 1400s, 15th, altitude, ancient, angle, armilla, armillary, astronomical, azimuth, beijing, century., china, chinese, declination, elevation, historical, instrument, measurement, measuring, observatory, sphere, theodolite

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