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| | 100 to 104 of 227 glossary terms |
| Italian hours: system of hour reckoning, see article on time and date.
| Jacob's staff: name for a cross-staff, especially when used for surveying, see article on the cross-staff.
| Julian calendar: calendar introduced by Julius Caesar and used in Europe until the sixteenth century, or later, see article on time and date.
| latitude: angle above or below the equator to indicate position on the earth. The celestial latitude, however, is an angular distance with respect to the ecliptic.
| latitude plate: part of an astrolabe with a projection of altitude and azimuth lines on to the equatorial plane, see article on the astrolabe.
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