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Just as in a circle, it is necessary to know three points to determine the circumference; so in ascertaining the elements of a comet, three different positions must be observed before what astronomers call its "ephemeris" can be established.
These economies went on increasing year by year, and every dollar that was saved went into the work of making the tables necessary for the future use of the Ephemeris.
In the writing-office of the Ephemeris, which would be given to the public the first thing in the morning, five hundred slaves or more were occupied in writing from dictation a list of the owners of the horses, of the 'agitatores' who would drive them, and of the prizes offered to the winners, whether Christians or heathen.
Samuel got a hundred and fifty pounds of bread, with a small quantity of rum and wine, also a quadrant and compass; but he was forbidden, on pain of death, to touch either map, ephemeris, book of astronomical observations, sextant, time-keeper, or any of my surveys or drawings.
"The astrologer complied with the request of the mysterious visitor, drew forth his tables, consulted his ephemeris, and cast the horoscope or celestial map for the hour and the moment of the inquiry, according to the established rules of his art. "The elements of his calculation were adverse, and a feeling of gloom cast a shade of serious thought, if not dejection, over his countenance.
The mere preparation of the ephemeris includes but a small part of the work of mathematical calculation and investigation required in astronomy. One of the great wants of the science to-day is the reduction of the observations made during the first half of the present century, and even during the last half of the preceding one.
But being referred to a meridian far outside our limits and at the same time designed for use within those limits, it was necessary to make a division of the matter. Accordingly, the American Ephemeris has always been divided into two parts: the first for the use of navigators, referred to the meridian of Greenwich, the second for that of astronomers, referred to the meridian of Washington.
In many a colonial household where the Bible and psalm-book formed the sole standing library, the almanac was the only annual book-comer that crossed the threshold and lodged under the roof-tree. On a nail by the side of the great fireplace hung proudly and prominently the Family Almanac, the Ephemeris.
The consciousness of a train of great days and victories behind. They shed an united light on the advancing actor. He is attended as by a visible escort of angels. That is it which throws thunder into Chatham's voice, and dignity into Washington's port, and America into Adams's eye. Honor is venerable to us because it is no ephemeris. It is always ancient virtue.
He accordingly erected his scheme, or figure of heaven, divided into its twelve houses, placed the planets therein according to the ephemeris, and rectified their position to the hour and moment of the nativity.
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