EPACT n.
The moon's age at the beginning of the calendar year, or the number of days by which the last new moon has preceded the beginning of the year. Annual epact, the excess of the solar year over the lunar year, -- being eleven days. -- Menstrual epact, or Monthly epact, the excess of a calendar month over a lunar.…
EPIPHANY n.
A church festival celebrated on the 6th of January, the twelfth day after Christmas, in commemoration of the visit of the Magi of the East to Bethlehem, to see and worship the child Jesus; or, as others maintain, to commemorate the appearance of the star to the Magi, symbolizing the manifestation of Christ to the Gentl…
EQUATOR n.
nt with the plane of the earth's equator; -- so called because when the sun is in it, the days and nights are of equal length; hence called also the equinoctial, and on maps, globes, etc., the equinoctial line. Equator of the sun or of a planet (Astron.), the great circle whose plane passes through through the center o…
EQUATORIAL n.
er right ascension, or the hour angle, so that the telescope may be directed, even in the daytime, to any star or other object whose right ascension and declination are known. The motion in right ascension is sometimes communicated by clockwork, so as to keep the object constantly in the field of the telescope. Called…