| Leap seconds are inserted only for human convenience, and eclipse phenomena are computed using astronomers' dynamical or ephemeris time systems. |
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| The GPS position solution can be improved by using a better satellite ephemeris. |
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| The navigation message contains the satellite ephemeris, which is a numerical model of the satellite's orbit. |
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| To make them useful to navigators, however, it was necessary to prepare from them an ephemeris of the Moon for every noon and midnight. |
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| The astronomers then introduced a new scale of time, more stable, based on the revolution of the Earth around the Sun, and called ephemeris time. |
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| Allows ephemeris data to be automatically updated onto your phone when the data has expired. |
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| Newcomb's tables were used to form a solar ephemeris, or a table that gives the Sun's coordinates for successive values of Ephemeris Time. |
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| Note that downloaded Demo version contains abbreviated help files, atlas, and ephemeris. |
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| They were obtained using adjustments orbits, they are not independent of methods and planetary ephemeris used for their determination. |
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| The results of the solution of the least-squares equation are used to update the ephemeris and attitude values of each orbit path. |
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| All this is possible thanks to the possibility of always knowing, with absolute accuracy, the ephemeris or all satellites in altitude, that is their relative position. |
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| Dr McCarthy began by reviewing the history of the SI second, noting that its duration has its origin in the ephemeris second, which is based on 19th century astronomical observations. |
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| Accuracy is dependent upon various factors including the number of satellites tracked, constellation geometry, observation time, ephemeris accuracy, ionospheric disturbance, multipath and resolved ambiguities. |
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| An ephemeris is usually only correct for a particular location on the Earth. |
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| The lunar ephemeris, however, contains an empirical, nongravitational term, which was needed to correct for the effects of tides raised in the Earth by the Moon. |
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| Among his other notable contributions, Brouwer formulated the term ephemeris time to describe time measurement unaffected by variation in the rate of the Earth's rotation. |
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| Our competence is limited to the solar system bodies ephemeris, the celestial mechanics, the observation of the solar system bodies and to the calendars. |
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| As a result of adjusting the satellite ephemeris and attitude data before resampling the data, the final result also succeeds in preserving the radiometric integrity of the data. |
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| An interactive ephemeris Internet server is available for astronomers and public who wish to obtain the solar system star position and their physical parameters. |
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| This edition, published under the responsibility of the Bureau des Longitudes since 1795, is the 327th of an ephemeris which appeared without interruption since its creation. |
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| This year two improvements were made: the ephemeris were calculated by introducing precession and nutation models recommended in 2000 by the UAI and the ephemeris of Saturn satellites are resulting from a new theory. |
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| The Working Group noted that international cooperation and coordination in improving the Apophis ephemeris was important for obtaining a better understanding of the threat to Earth posed by the Apophis asteroid. |
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| Thus, the use of other planetary sources, other planetary bodies or the use of numerical integration methods are not robust, can produce significant deviations in numerical ephemeris covering long periods of time. |
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| Atmospheric delay and satellite ephemeris errors have been significantly reduced. |
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| The astronomical position calculated from an ephemeris is given in the spherical polar coordinate system of right ascension and declination. |
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| Subsequent broadcasts from an updated satellite would contain its most recent ephemeris. |
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| The orbital ephemeris is transmitted in a data message that is superimposed on a code that serves as a timing reference. |
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| After the satellite maneuver, engineers track the new orbit from the ground, upload the new ephemeris, and mark the satellite healthy again. |
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| The Photographer's Ephemeris is a free useful software tool for photographers needing the times of twilight and the rise and set times of the sun and moon. |
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| In the meantime, Columbus mesmerized the natives by correctly predicting a lunar eclipse for February 29, 1504, using the Ephemeris of the German astronomer Regiomontanus. |
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