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| | 76 to 80 of 227 glossary terms |
| geographical astrolabe: form of astrolabe, where the lower plate is projected for the earth, while the rete includes the ecliptic.
| geographical planisphere: map of the earth, produced by geometrical projection of a sphere on to a flat surface. Included as the more prominent part of the geographical astrolabe.
| geometrical square: form of quadrant, with sides divided equally and having an alidade at one corner, used for measuring angles in terms of ratios in the manner of a shadow square on the back of an astrolabe.
| globe dial: form of sundial, where the hour lines are on the outer surface of a sphere.
| gnomon: the part of a sundial that casts the shadow for indicating the time.
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