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Topic: Ephemeris


In the News (Tue 22 Apr 14)

  
  Ephemeris Consulting Group, Inc.
Ephemeris staff can work from the Atlanta office with broadband connectivity, data warehouse servers, and a software development facility, or with easy connections from Atlanta’s airport can work from the client’s facility anywhere in the USA with an on-site presence as desired, including full-time.
With an Ephemeris contract guaranteeing long-term support, no costs unless work is requested, an easy termination option with no exit cost, and all IP rights assigned to the client, using Ephemeris as a supplementary staff resource is a decision that can easily be recognized as a best practice in business management.
Ephemeris (E-fem-er-us) is a navigational term meaning the data set that describes the location of a star, planet, satellite, or other object in the sky.
www.ephemeris-cg.com   (282 words)

  
 Minor Planet & Comet Ephemeris Service
Ephemeris Options (applicable only if selecting ephemeris return):
By default, ephemerides are geocentric, begin now and are for 20 days at 1 day intervals.
Default text for this is supplied, but should be replaced.
cfa-www.harvard.edu /iau/MPEph/MPEph.html   (466 words)

  
  Swiss Ephemeris - for 6000 years and more - Astrodienst
The SWISS EPHEMERIS is the new high precision ephemeris developed by Astrodienst, largely based upon the DE406 ephemeris from NASA's JPL.
The Swiss Ephemeris is based upon the latest planetary and lunar ephemeris, DE405/406, developed by NASA's Jet Propulsion Laboratory.
This compressed ephemeris reproduces the JPL data with 0.001 arcseconds precision.
www.astro.com /swisseph   (1011 words)

  
  Ephemeris-Dependent Timeline Events   (Site not responding. Last check: )
Ephemeris (i fem' er is) - A Table showing the positions of a heavenly body at regular intervals in time.
Because of the earth's rotation once every 24 hours and its yearly trek around the sun, the positions of the sun, moon, and stars overhead continuously change.
Any event during a mission that is affected by those positions is "ephemeris dependent" and must be replanned if the Shuttle doesn't launch at the beginning of the launch window.
science.nasa.gov /Realtime/Rocket_Sci/clocks/time-ephemeris.html   (244 words)

  
 Ephemeris - Wikipedia, the free encyclopedia
For scientific uses, a modern planetary ephemeris comprises software that generates positions of the planets and often of their satellites, or of asteroids or comets at virtually any time desired by the user.
Scientific ephemerides for sky observers mostly contain the position of the mentioned celestial body in right ascension and declination, because these coordinates are the most often used on star maps and telescopes.
An ephemeris is usually only correct for a particular location on the Earth.
en.wikipedia.org /wiki/Ephemeris   (560 words)

  
 Astrology Monthly Newsletter: Ephemeris Special April, 2005
Ephemeris is a table listing the position of one or more celestial bodies or planets for each day of the year.
The ephemeris is issued well in advance of the dates covered and contains such information as the daily right ascension and declination of the sun, moon, planets, and other celestial bodies, and daily data on the sunrise, sunset, moonrise, and moonset.
The ephemeris for an object in the sky is a listing of the celestial coordinates pinpointing the object's location at a particular time as it moves in the sky.
www.findyourfate.com /newsletter/2005/april2005.htm   (1234 words)

  
 Using the JPL Solar System Ephemeris
The ephemeris contains equation coefficients which describe the three-dimensional positions and velocities of the sun, moon, and planets as a function of time in a rectangular coordinate system.
The solar system barycentric positions of the earth and moon may be derived from the ephemeris specifications of the position and velocity of the earth-moon barycenter and the geocentric position and velocity of the moon.
For the moment we shall assume that we have a computational source for the observatory's geocentric position and proceed with a brief description of computing the apparent position of an object in the sky.
www.cv.nrao.edu /~rfisher/Ephemerides/ephem_use.html   (2148 words)

  
 [No title]   (Site not responding. Last check: )
For all others, the ephemeris is supplied in ASCII format and must be converted (a one-time only process) into binary format for installation; software is supplied for this conversion.
A smaller portion of a binary ephemeris file may be extracted from a larger file using "binshort.f".
The reading and interpolating subroutines included in "testeph", along with the ephemeris file(s) themselves, are the items which are of eventual interest to the user.
iau-comm4.jpl.nasa.gov /README   (2338 words)

  
 Description of JPL Solar System Ephemeris
Many versions of this ephemeris have been produced to include improved measurements of the positions of the Moon and planets [refs 1,2] and to conform to new and improved coordinate system definitions.
header containing a few lines of annotation, the ephemeris time span, values of many constants assumed by the computer integration, and an index table that tells the relative locations of the data for the different solar system objects in the data blocks to follow.
This was the best available planetary ephemeris as of 1983, spanning the 1850-2050 time range, based on transit circle measurements since 1911, planetary radar since 1964, lunar laser ranging since 1969, and Viking spacecraft ranging on Mars since 1974.
www.cv.nrao.edu /~rfisher/Ephemerides/ephem_descr.html   (1652 words)

  
 CD Baby: EPHEMERIS: Love at First Fight
The taste for simple rock and roll is something to keep you moving, as lead singer Nicole's sultry voice and ironic lyrics, bring you down into her dark world with tales of love, addiction, and the greed and dirty deeds of those who think they have it all.
Ephemeris is a three piece from my hometown, Pittsburgh, and is made up of Jesse Levi on drums, Nicole R on vocals, and Phil Anderson on guitars.
Ephemeris surprised me with their six song EP, that contains moments that are capable of sneaking up on you causing you to rock before you even know it.
www.cdbaby.com /cd/ephemeris   (635 words)

  
 STK: External Files - Ephemeris File Format (*.e)
Ephemeris files can be useful when you need to provide STK with position and velocity data for a vehicle to model certain unique circumstances.
By default, STK assumes that all distance measurements in an ephemeris table are in meters and velocities are in meters/second.
Hermitian interpolation assumes that the velocity component of the ephemeris is the derivative of the position.
www.stk.com /resources/help/stk613/helpSystem/stk/importfiles-02.htm   (2559 words)

  
 SSC:Late Ephemeris Updates
Late ephemeris updates required within 2 weeks of the start of the week in which the observation is scheduled produce a significant disruption to the routine spacecraft commanding process and are considered equivalent in impact to a medium or high-impact ToO.
Consequently a Late Ephemeris update requested within 2 weeks of the start of the week in which the observation is scheduled will need an extremely strong scientific justification, and must also be reviewed and approved by the SSC Director prior to implementation.
To request the late ephemeris update, using the guidelines above, determine the AOR to which it needs to be applied, open (modify) the AOR in Spot, and select the "Special" button at the bottom of the AOR.
ssc.spitzer.caltech.edu /documents/lateephem.html   (875 words)

  
 Analysis Of Replaced Ephemeris Files
This file was the fourth in a series of 18 ephemeris files throughout the Summer and Fall of 1998 which had jumps in the definitive arc state vector.
A new ephemeris file was obtained in which the the leap second was removed and TSDIS processing was continued using this file for orbits 6294 and 6295.
A second new ephemeris was obtained, in which the epoch time was at the beginning of 12/31/98, and again the leap second was removed (to keep even 60 second intervals in the file).
gcdc.gsfc.nasa.gov /ephems/analysis.html   (12564 words)

  
 Ephemeris - LoveToKnow 1911
EPHEMERIS (Greek for a "diary"), a table giving for stated times the apparent position and other numerical particulars relating to a heavenly body.
The Astronomical Ephemeris, familiarly known as the "Nautical Almanac," is a national annual publication containing ephemerides of the principal or more conspicuous heavenly bodies, elements and other data of eclipses, and other matter useful to the astronomer and navigator.
The governments of the United Kingdom, United States, France, Germany and Spain publish such annals.
www.1911encyclopedia.org /Ephemeris   (112 words)

  
 Alcyone Ephemeris Documentation
Alcyone Ephemeris is an accurate and fast astronomical ephemeris calculator covering the period 3000 BC to AD 3000.
These files, which file extension is ‘.ae’, contain information on the settings of the ephemeris, the settings of the plot, the view of the main window, and the assigned script.
The ephemeris data of a column can be searched for specific values by means of the find function, which is used after the ephemeris calculation.
www.alcyone-ephemeris.info /documentation/aedoc.html   (7231 words)

  
 ephemeris time
In 1960 the 11th CGPM abandoned the definition of the second as a fraction of the mean solar day in favor of the ephemeris second.
One was that the ephemeris second was based on a standard that could never be measured again.
The astronomers stuck with Ephemeris Time until 1979, when they defined two new time scales that used the atomic second and that took into account relativity (velocity affects time).
www.sizes.com /time/time_ephemeris.htm   (434 words)

  
 JPL Planetary And Lunar Ephemerides On CD-ROM
DE406 is the same ephemeris as DE405, though the accuracy of the interpolating polynomials has been lessened (interpolation on the 64-day mesh points remains exact, however).
DE406 : the New "JPL Long Ephemeris" (includes neither nutations nor librations) JED 0625360.50 (-3000 FEB 23) to 2816912.50 (+3000 MAY 06) DE406 is the same ephemeris as DE405, though the accuracy of the interp- olating polynomials has been lessened (interpolation on the 64-day mesh points remains exact, however).
For the ascii versions, the main ephemeris data come in 20-year pieces; each piece is composed of a number of 32-day blocks or of 64-day blocks.
www.willbell.com /software/jpl.htm   (2250 words)

  
 Your Sky Help: Ephemeris
The ephemeris shows you the positions of the principal bodies in the Solar System at the selected time, both in celestial coordinates, and as seen from your specified observing site for sky and horizon maps.
If you're tracking an asteroid or comet by specifying its orbital elements, its position is given at the foot of the table.
The sample ephemeris above gives positions for 00:00 UTC on March 1, 1995, while tracking the Earth-orbit-crossing asteroid 1995 DW1, whose discovery (on February 25, 1995) was reported in Minor Planet Electronic Circular 1995-E02 of 00:15 UTC, March 1, 1995, giving the orbital elements shown at the end of this page.
www.fourmilab.ch /yoursky/help/ephemeris.html   (412 words)

  
 How to read the JPL Ephemeris and Perform Barycentering
Other differences are that the DE200 ephemeris is nominally referenced to the FK5 coordinate system, which is tied to nearby stars, whereas the the DE405 ephemeris is referenced to the ICRS system, which is tied to distant radio quasars.
For the purposes of barycentering, the primary uses of the JPL Ephemeris table are in calculating rearth, vearth, and rsun (used in calculating th).
Generally speaking only a single ephemeris row (ie, a single 32-day interval) is of interest, but there is always the possibility that an observation spans two 32-day intervals, etc. For safety's sake I always read the adjacent rows as well.
lheawww.gsfc.nasa.gov /users/craigm/bary   (3923 words)

  
 Definitive Ephemeris   (Site not responding. Last check: )
An ephemeris is a set of data that provides the assigned places of a celestial body (including a manmade satellite) for regular intervals.
In the context of Landsat 7, ephemeris data shows the position and velocity of the spacecraft at the time imagery is collected.
Daily definitive ephemeris profiles have been archived since June 29, 1999 and are available for downloading.
ltpwww.gsfc.nasa.gov /IAS/handbook/handbook_htmls/chapter11/htmls/definitive_ephemeris.html   (319 words)

  
 Astrology Ephemeris Files for 6000 years - Astrodienst
The ephemeris files may be downloaded and printed for private use only.
The links appearing as numbers contain the ephemeris for this year; the links 'A' contain a list of mundane aspects (aspects formed by the moving planets on the sky).
For years marked with 'j' like 1500j the Ephemeris is in the Julian Calendar, otherwise it is in the Gregorian Calendar.
www.astro.com /swisseph/swepha_e.htm   (249 words)

  
 ephemeris.com Free Ephemeris Software
This software reads and writes NASA's Jet Propulsion Laboratory planetary ephemeris files, and calculates positions and velocities with the full precision of the original JPL software, which is written in FORTRAN.
Myles Standish of NASA's Jet Propulsion Laboratory for the JPL ephemeris files (DE200, DE405, DE406, etc.).
The U.S. Naval Observatory uses the current JPL ephemeris, DE405, to compute positions in The Astronomical Almanac.
www.ephemeris.com /software.html   (481 words)

  
 Using the Ephemeris File
When the ephemeris file has been satisfactorily established on mass storage it can be accessed by the export software.
is the most convenient subroutine for ephemeris access.
for the retrieval of ephemeris quantities is recommended.
star-www.rl.ac.uk /star/dvi/sun87.htx/node28.html   (263 words)

  
 Planet Ephemeris for January through May 2007
Planet ephemeris for January 2007, 00:00:00 UT., mean Moon node Longitude
Planet ephemeris for February 2007, 00:00:00 UT., mean Moon node Longitude
Planet ephemeris for March 2007, 00:00:00 UT., mean Moon node Longitude
www.skyviewzone.com /ephemeris.htm   (52 words)

  
 Programming interface to the Python Port of Swiss Ephemeris
If the user does not want an ephemeris for the time before 1500 he might prefer to work with the short files.
In this case the default ephemeris is Swiss Ephemeris.
It works only with the JPL and the Swiss Ephemeris, not with the Moshier ephemeris; and only with physical bodies, but not with the nodes and the apogees.
home.earthlink.net /~soloj/swephprg.htm   (2406 words)

  
 Welcome to Mona Magick
An Ephemeris is a day-by-day listing of the astrological positions of each planet.
To me, an Ephemeris is a fascinating story just waiting to be discovered.
Using an Ephemeris in conjunction with Lunar aspects can give you a very high advantage with divinations and your life overall.
www.monamagick.com /resources_moon_emph.html   (897 words)

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