from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Plural form of ephemeris.
- n. An ephemeris.
from The Century Dictionary and Cyclopedia
- n. Plural of ephemeris; formerly sometimes used as a singular.
Sorry, no etymologies found.
And, although the ephemerides of the inner planets are very well known, most likely due to accurate radar measurements in part, this is the first time that such precision is possible for an outer planet.
I suspect the ancient Greeks set it up this way because it made astrology amenable to mathematical analysis and easier to construct ephemerides.
We have him to thank for ephemerides, those great tables of computed places of celestial bodies over long periods of time.
It is well known that everything is miraculous in the history of the Jews; the miracle performed in favor of King Hezekiah on the dial of Ahaz is one of the greatest that ever took place: it is evident that the whole earth must have been deranged, the course of the stars changed forever, and the periods of the eclipses of the sun and moon so altered as to confuse all the ephemerides.
 Garcaeus, dabimus hoc petulantibus ingeniis, we will in some cases allow: or let him make an ephemerides, read Suisset the calculator's works,
* I feel not in me those sordid and unchristian desires of my profession; I do not secretly implore and wish for plagues, rejoice at famines, revolve ephemerides and almanacks in expectation of malignant aspects, fatal conjunctions, and eclipses.
This in turn led to a moderate increase in the accuracy of calendars and astronomical tables, or ephemerides, then commonly used by astrologers to cast horoscopes and by sailors for navigational purposes.
For the accuracy, I am depending on the ephemerides.com site sponsored by JPL.
The evil of the time is the multiplication of ephemerides.
They may have looked at Kaiev's ephemerides and figured it out.
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