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Easter table: table for calculating the date of Easter, see article on time and date.
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ecliptic: line on the celestial sphere representing the annual path of the sun through the stars.
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epacts: numbers used in the calculation of Easter, see article on time and date.
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equal hours: system of hour reckoning, see article on time and date.
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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.
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equatorial: relating to or based on the equator. Has much the same meaning as equinoctial.
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equatorial dial: another name for equinoctial dial.
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equatorium: instrument to determine the longitude of one or more of the planets at any given time.
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equinoctial: relating to or based on the equator, or relating to the equinox.
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equinoctial dial: sundial where the hour plate or circle is set parallel to the equator, see article on the sundial.
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