Astronomical Quadrants Illustration
Bildnummer 11655331
| Plate from 18th century encyclopedia showing an illustration of Gunter's and Sutton's quadrants. A quadrant is an instrument made of wood,brass or other substance,containing a kind of stereographic projection of the sphere on the plane of the equinoctial,the eye being supposed to be placed in one of the poles,so that the tropic,ecliptic,and horizon form the arcs of circles,but the hour circles are other curves,drawn by means of several altitudes of the sun for some particular latitude every year. This instrument is used to find the hour of the day,the sun's azimuth,etc.,and other common problems of the sphere or globe,and also to take the altitude of an object in degrees | |
| Lizenzart: | Lizenzpflichtig |
| Credit: | Science Photo Library / Parker, David |
| Bildgröße: | 4805 px × 6989 px |
| Modell-Rechte: | nicht erforderlich |
| Eigentums-Rechte: | nicht erforderlich |
| Restrictions: | - |
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