The J2000. 0 epoch is precisely Julian date 2451545.0 TT (Terrestrial Time), or January 1, 2000, noon TT . This is equivalent to January 1, 2000, 11:59:27.816 TAI or January 1, 2000, 11:58:55.816 UTC.
22 окт. 2017 г. · The prefix "J" indicates that it is a Julian epoch and the number refers to January 1, 2000, 12:00 Terrestrial Time. |
Its primary direction is the equinox of J2000. 0, and does not move with precession and nutation, but it is otherwise equivalent to the above systems. Spherical coordinates · Rectangular coordinates... |
The current standard epoch of equatorial coordinates is J2000.0 which refers to the RA and Dec of an object on 2000 Jan 1 12UT also called 2000 Jan 1.5. |
*Caution: The name “J2000” is also used to refer to the zero epoch of the ephemeris time system (ET, also known as TDB). Z is normal to the mean equator of date ... |
Usually you would accept one or more of J2000, Topocentric or Observed coordinates at your discretion. To specify a particular coordinate type you must set the ... |
Common examples are B1950. 0 and J2000. 0, where the B and J stand for slightly different sorts of year. |
Help Coordinate Calculator. Hide Input Options. System. Equatorial, Ecliptic, Galactic, SuperGalactic. Equinox. J2000.0 ... Position Angle (East of North). Hide ... |
28 окт. 2013 г. · J2000 is just JD2451545.0 (ref), so you can just convert J2000 to JD and follow an algorithm to get Gregorian date from JD. Here is some python ... |
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