An ephemeris is a twin sister of the Almanac, and gives the geocentric Longitudes and Declinations for the current year. It is absolutely necessary in astrological calculations. But just as it is necessary to get a new almanac for each year to see when the Moon is new and full, when it is Easter or Christmas, etc., so also is it necessary to have an ephemeris for every year when we want to cast horoscopes for people. True, the planets circle about the Sun, but each has its own specific speed, and they do not come into the same position relative to one another that they have while you are reading this, until a period which is called the Great Sidereal Year (25,868 ordinary years), has elapsed. Therefore all horoscopes, even the horoscopes of twins differ, and it is necessary to have an ephemeris for the birth year of any person before you can cast his horoscope. Equator:
The earth's equator is an imaginary line in a plane at right angles to the axis of the earth, and midway between the North and South poles. It divides the earth into two hemispheres, the Northern and Southern. If a pole hundreds of millions of miles in length were thrust through the earth from the equator to the center of the earth, the outer end would inscribe a line on the firmament, when the earth rotates on its axis, and this imaginary line is called the celestial equator, or equinoctial. The latter name is given it because when the Sun is at the points where the ecliptic or Sun's path crosses the celestial equator we have the equinoxes, the times when the days and nights are of equal duration.
Equinoctial: See 'Equator.'
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