Manipulating various representations of time. This document describes the software available in the SPICE Toolkit for The variable names used are consistent with notations used in the Most Used SPICE APIs document (mostused.html). Astrophys., "Time Scales in the JPLĪnd CfA Ephemerides", 336, 381-384 (1998). James Jespersen and Jane Fitz-Randolph ``From Sundials toĪtomic Clocks-Understanding Time and Frequency'' Kenneth Seidelmann, University Science Books, The Explanatory Supplement to the Astronomical Almanac (1992)Įdited by P. Reference System on Algorithms for Computing Time DifferencesĪnd Clock Rates, JPL IOM 314.5-942, 1 October 1985. Moyer, T.D., Effects of Conversion to the J2000 Astronomical Of Reference, Parts 1 and 2," Celestial Mechanics 23 (1981), Moyer, T.D., "Transformation from Proper Time on Earth toĬoordinate Time in Solar System Barycentric Space-Time Frame The formulation and the values used in this document are taken from the Several time systems and common time formats. SPICE Time Subsystem provides routines for convertting times between CSPICE naming conventions 1997 JUL 22 by NAIF. Parsing Time Strings An Outline of the Parser Tokenizing the Input String Combining and Removing Tokens Initial Token Processing Julian Dates Calendar Dates ISO Formats Other Calendar Formats Built in Representations Last Resort Production Rules Conclusion Appendix D: Document Revision History 2021 SEP 10 by E. Summary of Time Subsystem Routines Appendix B. and P.M.) Labels (Time Zones) Labels ( TDB, TT, and UTC ) Changing Default Behavior Abbreviated Years Range of Time String Components Default Time Systems, Time Zone, and Calendar Changing the Time System Time Zones Calendars Usage example Appendix A. SPICE Time Subsystem Abstract References Introduction Intended Audience Overview SPICE Time Representations Coordinated Universal Time (UTC) International Atomic Time (TAI) Naming the seconds of TAI - UTC Tying UTC to the Earth's Rotation Leapseconds The Leapseconds Kernel (LSK) Barycentric Dynamic Time (TDB) The J2000 Epoch Barycentric Dynamical Time (TDB) Terrestrial Time (TT) The Relationship between TT and TDB In the Toolkit ET Means TDB Naming the Seconds of TDB Leapseconds Computing UTC from TDB Problems With the Formulation of DeltaET Spacecraft Clock (SCLK) Julian Date The abbreviation JD Time Subsystem Routines Routine to load needed kernels Routine to convert a time string to TDB (ET) Routine to convert UTC to TDB (ET) Routine to convert a spacecraft clock time string to TDB (ET) Routine to convert a TDB (ET) to a time string based on a format template Routine to convert a TDB (ET) to UTC Routine to convert a TDB (ET) to Spacecraft Clock time string Routine to convert a TDB (ET) to Calendar format TDB Routine to convert a TDB (ET) to Local True Solar Time Routine to convert a TDB (ET) to planetocentric longitude of the sun Routine to convert between uniform time scales Routine to compute the difference between TDB (ET) and UTC Routine to create a time string format picture Routines returning time constants Foundation Routines and Utilities Parse a time string to a time vector Convert between different parsed representations of time Time utility routines Input String Conversion Parsing Time Strings Labels (A.M.
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