Examples of using Ephemerides in English and their translations into Russian
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Official
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Colloquial
The EPM and DE430 ephemerides are compared.
Ephemerides of NEAs and some unusual minor planets;
He made extensive ephemerides of solar system bodies.
However it is necessary also to take into account perturbations of smaller bodies in order to obtain high-precision ephemerides.
EPM(Ephemerides of Planets and the Moon) are being constantly developed since 1970s.
Regiomontanus publishes his day-to-day Ephemerides in Nürnberg, Germany.
But the ephemerides in the Nautical Almanac, by then a separate publication for the use of navigators, continued to be expressed in terms of UT.
For celestial navigation the Portuguese used the Ephemerides, which experienced a remarkable diffusion in the 15th century.
The brief history of creation, modern state anddevelopment prospects of Russian nautical astronavigational ephemerides are given.
In a number of the package sections such as"Ephemerides","O-C","Tracks","Orbits" computations can be fulfilled for the moments of time lying outside of the basic interval.
In the case of GNSS, the coordinates of an object on Earth are related to the same reference system as the ephemerides of the GNSS constellation.
Keywords: ephemerides of the Moon, the Sun and planets, ephemeris support of the GLONASS system, navigational satellite ephemerides, navigation equipment.
The message has variable size- each pseudo-frame usually includes six strings and contains ephemerides for the current satellite(string types 10, 11, and 12 in a sequence) and part of the almanac for three satellites three strings of type 20.
Based on ephemerides produced by astronomer Giovanni Cassini and others, Pierre-Simon Laplace created a mathematical theory to explain the resonant orbits of Io, Europa, and Ganymede.
Practical introduction took some time(see Use of ephemeris time in official almanacs and ephemerides); ephemeris time(ET) remained a standard until superseded in the 1970s by further time scales see Revision.
The ephemerides continued on this basis through 1983(with some changes due to adoption of improved values of astronomical constants), after which, for 1984 onwards, they adopted the JPL ephemerides.
Fundamental catalogue FK6 was used at calculation of star's ephemerides, and the ephemerides of the stars which were not including in this catalogue, are based on HIPPARCOS catalogue.
The ephemerides are updated every 30 minutes using data from the Ground Control segment; they use Earth Centred Earth Fixed(ECEF) Cartesian coordinates in position and velocity, and include lunisolar acceleration parameters.
For NEOs, MPC collects, organizes and verifies data,provides preliminary orbits and ephemerides, posts a list of tentative NEO objects that need confirmation via additional observations and, if appropriate, provides Earth impact predictions.
However, each realization of these ephemerides is calculated using a fixed set of observational data and loses in accuracy of the coordinates of the perturbing bodies outside the observational interval.
Values quoted in barycentric dynamical time(TDB) orequivalent time scales such as the Teph of the Jet Propulsion Laboratory ephemerides represent the mean values that would be measured by an observer on the Earth's surface(strictly, on the surface of the geoid) over a long period of time.
The yearbook"Ephemerides of minor planets"(published since 1948) contains information on orbital elements of numbered minor planets and the circumstances of their observations during the best observation periods.
The first part of the almanac gives the 2018 calendar,description of calendar systems used by various peoples in the world, ephemerides for the Sun, the Moon, and planets, moments of rising and setting for the Sun and the Moon, planetary configurations, the visibility of planets and Jupiter's satellites on the sky, some data on variable stars, comets, occultations of stars by the Moon and asteroids, meteor showers, eclipses, and other celestial phenomena.
They include ephemerides of hour angles of the first point of Aries, the Sun and the Moon, declinations of the Sun and the Moon for each hour, and also hour angles and declinations of planets(Venus, Mars, Jupiter and Saturn) with a 5 hour step and to within 0.1.
The availability of clock corrections and precise ephemerides is extremely useful in producing geodetic positions in ITRF-yy free from systematic errors induced deliberately in the GPS satellite signal through Selective Availability SA.
These ephemerides, and the monthly ephemerides of the 160 stars and the tables of Polaris, the interpolational tables, the modified table of altitudes and azimuths of stars TAA-57, and a number of auxiliary tables allow to solve main navigatoval tasks by methods of classical naval astronomy without additional manuals.
The basis of the"Nautical Astronomical Yearbook"(NAY, in Russian)is the daily visual geocentrical equatorial ephemerides of brightest navigational stars- the Sun, the Moon, four major planets(Venus, Mars, Jupiter, Saturn) and of the 69 brightest stars, and the time of the rising and setting of the Sun and the Moon, the time of the beginning and the end of civil and navigational twilights, the azimuths of the upper limb of the Sun on rising and setting.
Ephemeris of objects in the period of validity of orbital data.
Hot start- the almanac, ephemeris are known, time and a position are known with some mistakes.