JD2TT
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Contents: Description, Arguments, Usage, Examples, Sub-Functions, Related Functions, Source Supported Under Version: > 1.15
Description Convert input UTC Julian Date (in days) to TT Julian Date by adding TT-UTC offset (accounts for leap seconds)
Arguments and Return Values Parameters: Numeric array specifying the UTC Julian Dates to convert to TT Julian Dates Return Value: The corresponding set of TT Julian Dates
Usage Syntax: JD2TT(JD) The Julian Date (JD) is a continuous count of days since noon UTC on January 1, 4713 BCE in the proleptic Julian calendar. Coordinated Universal Time (UTC) is the basis for the time system used in everyday life. In order to keep UTC consistent with the Earth's slightly variable rate of rotation, leap seconds are occasionally inserted into UTC. Terrestrial Time (TT) is a time system with no leap seconds. Returns double-precision Julian Dates in Terrestrial Time. The returned values are as accurate as the input, although that accuracy may be further limited by uncertainty in Delta-T. See the function DeltaT for details. For more information, see http://heasarc.gsfc.nasa.gov/docs/xte/abc/time_tutorial.html and http://www.giss.nasa.gov/tools/mars24/help/algorithm.html. When JD2TT() is entered without any arguments, it prints its description, as shown below.
Examples dv> JD2TT() Convert input UTC Julian Date (in days) to TT Julian Date by adding TT-UTC offset (accounts for leap seconds) Works for array inputs Returns double-precision Julian Date in Terrestrial Time The returned values are as accurate as the input, although that accuracy may be further limited by uncertainty in Delta-T. See the function DeltaT for details. See http://www.giss.nasa.gov/tools/mars24/help/algorithm.html S.Marshall 08-14-2008 0 dv> a = JD(2000, 1, 1, 12, 0, 0) 2451545.00000000 dv> JD2TT(a) 2451545.00074287 |
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Recent Library Changes Created On: 11-18-2009 |
