Ephemeris
Related Category: Astronomy: General
(fm´rs) (pl., ephemerides), table listing the position of one or more celestial bodies for each day of the year.
Ephemeris
An ephemeris (plural: ephemerides) (from the Greek word ephemeros = daily) was, traditionally, a table providing the positions (given in a Cartesian coordinate system, or in right ascension and declination or, for astrologers, ...
ephemeris time
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side-by-side A Dictionary of Astronomy The Columbia Encyclopedia, Sixth Edition ...
ephemeris - Latin, originally from the Greek "ephémeros, -on," daily. An almanac of the daily motions of the planets and stars.
ephemeris.com - A website devoted to information about time and motion in the universe.
The Solar System: ...
Ephemeris Second
31,556,925.974 ephemeris seconds are defined as the length of the 1900.0. This differs from the SI , which is defined in terms of vibration of a Cs atom.
Ephemeris
Wikipedia, the free encyclopedia - Cite This Source
An ephemeris (plural: ephemerides) (from the Greek word ephemeros = daily) is a table of values that gives the positions of astronomical objects in the sky at a given time or times.
ephemeris time (abbr E.T.) The uniform measure of time defined by the laws of dynamics and determined in principle from the orbital motions of the planets, specifically the orbital motion of the earth as represented by Newcomb's Tables of the Sun.
Ephemeris
An ephemeris is a tabulation of computed positions and velocities (and/or various derived quantities such as right ascension and declination) of an orbiting body at specific times. The plural form of ephemeris is ephemerides.
Ephemeris of Mars
Chapter 3. The Polar Regions
North Polar Region
North Polar Hood
North Polar Periphery
The Rima Tenuis
South Polar Region
South Polar Periphery
Measure the Polar Caps of Mars
Using the Micrometer "Zero' Method ...
Ephemeris Generators
These forms enable you to generate a table listing useful information about the viewing geometry for a planet and/or any of its moons as a function of time.
ephemeris ~: [ET] 'scientific time' - used between 1960 and 1983, this uniform timescale was based on the ephemeris second, itself derived from the period of rotation of the Earth at a particular date.
ephemeris
a table that gives the positions of astronomical objects at certain intervals of time
equatorial mount ...
Ephemeris (plural ephemerides) A tabulated list of positions for an object calculated from its orbital elements.
Ephemeris Time (ET). Determined in principle from the sun's apparent annual motion, ET is the numerical measure of uniform time, which is the independent variable in the gravitational theory of the earth's orbital motion, ...
Ephemeris: A table of positions in right ascension (celestial coordinate corresponding to longitude on earth) and declination (celestial coordinate corresponding to latitude on Earth), as a function of time for a moving celestial object.
Ephemeris
a table of data arranged by date. Ephemeris tables are typically to list the positions of the Sun, Moon, planets and other Solar System objects.
Ephemeris. A table or list of the predicted position of an object such as a planet.
Epoch. An instant in time for which the positions of celestial objects are given.
Ephemeris Time
(a) Time based on the ephemeris second. Ephemeris time is determined primarily from observations of the Moon against the background of stars, ...
Ephemeris Time [LLM96]
Eta Aquilae
A pulsating star in the constellation Aquila. It was the first Cepheid variable star discovered, in 1784. [C95]
Etalon ...
EPHEMERIS
An ephemeris is a table listing the spatial coordinates of celestial bodies and spacecraft as a function of time.
...
Ephemeris time is used by astronomers for the greatest degree of accuracy. Ephemeris are tables giving the computed positions of celestial bodies for every day of a given period. It is an astronomical almanac containing positional tables.
Ephemeris time
The term ephemeris time is in itself apt to refer to time in connection with any Astronomical Ephemeris. It has been used more specifically to refer:-...
(ET).
ephemeris - A table that gives the position of a celestial body at various times, or other astronomical data.
ET -- Ephemeris time, a measurement of time defined by orbital motions. Equates to Mean Solar Time corrected for irregularities in Earth's motions. Obsolete, replaced by TT, Terrestrial Time.
American Ephemeris and Nautical Almanac (NASA SP-7, 1965) An annual publication of the U.S.
- At the site, go to the "web interface" then select "Ephemeris Type: ELEMENTS", "Target Body: Jupiter Barycenter" and "Center: Sun".
to the ecliptic elongation the angular distance of a body from the Sun as seen from the Earth; a planet at greatest eastern elongation is seen in the evening sky and a planet at greatest western elongation is seen in the morning sky ephemeris ...
Ephemeris, vol. i.; R. Radau, " Inegalites planetaires du mouvement de la lune " (Annales, Paris Observatory, vol. xxi.); S. Newcomb, " Action of the Planets on the Moon," Ast. Papers of the Amer. Ephemeris, vol. v., pt. 3 (1896).
Several may be seen through binoculars, but an ephemeris is necessary.
It began in 1980 through the merger of The American Ephemeris and Nautical Almanac, produced by the USNO between 1855 and 1980, and The Astronomical Ephemeris, which originated in Britain in 1766 as The Nautical Almanac and Astronomical Ephemeris.
In 1999, an Egyptian papyrus was published which gives an ephemeris table for 24 BC with both Roman and Egyptian dates.
I looked up the ephemeris tables of the Moon, and you are right: counting only the times between minimum and maximum distance from Earth, those distances ARE variable, more than one would expect for, say, an Earth satellite in a long elliptical orbit.
Details of the positions of the objects can be found at the Minor Planet and Comet Ephemeris Service and instructions for using the webpage are detailed by the BAA here.
Jay, Delphine. "The Lilith Ephemeris." American Federation of Astrologers, 1983.
Ley, Willy. "Watcher's of the skies." Viking Press New York, 1969.
Littman, Mark. "Planets Beyond - discovering the outer solar system." John Wiley, 1988.
Finally, Bode, as editor of the Berliner Astronomisches Jahrbuch, opted for Uranus, after Latinized version of the Greek god of the sky, Ouranos; Maximilian Hell followed suit by using it in the first ephemeris, published in Vienna.
has an extensive list of cities and also allows you to input your own co-ordinates, if you have them.) Also, (under Controls/Options) I like it to display the Full Legend, Normal Mode, and set it to display the Moon as both an icon and ephemeris text.
NASA's Twelve Year Planetary Ephemeris provides detailed and accurate geocentric positions
Planetary Remote Sensing (part of the awesome Remote Sensing Tutorial by Nicholas M. Short Sr.)
Planetary Tour Guide ...
 See also: Earth, Time, Sun, Planet, Moon
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