Epact Scientific Instruments of Medieval and Renaissance Europe

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56 to 71 of 227 glossary terms
diptych dial: type of sundial which, in many cases, could be called an astronomical compendium, in the form of a folding tablet, usually in ivory, with at least a string gnomon and a horizontal dial on the inside, but often with other dials as well.
disc dial: type of sundial belonging in the class of altitude dial.
dividers: instrument with jointed legs for measuring and transferring distances, see article on the dividers.
dominical letter: letter denoting the day of the first Sunday of the year, see article on time and date.
drawing instruments: instruments used for drawing and constructing geometrical figures, see article on drawing instruments.
Easter table: table for calculating the date of Easter, see article on time and date.
ecliptic: line on the celestial sphere representing the annual path of the sun through the stars.
epacts: numbers used in the calculation of Easter, see article on time and date.
equal hours: system of hour reckoning, see article on time and date.
equator: circle on the earth's surface 90 degrees from the poles, or the circle on the celestial sphere 90 degrees from the celestial poles.
equatorial: relating to or based on the equator. Has much the same meaning as equinoctial.
equatorial dial: another name for equinoctial dial.
equatorium: instrument to determine the longitude of one or more of the planets at any given time.
equinoctial: relating to or based on the equator, or relating to the equinox.
equinoctial dial: sundial where the hour plate or circle is set parallel to the equator, see article on the sundial.
equinoctial ring dial: type of sundial, included as an equinoctial dial, comprising two pivoted rings and a bridge for adjusting for solar declination, or of three rings.
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