tempoch::constants Namespace Reference

Functions
double	j2000_jd_tt () noexcept
	J2000.0 epoch as a Julian Date in TT (2 451 545.0).
double	unix_epoch_jd () noexcept
	Unix epoch as Julian Date on the UTC axis (1970-01-01 midnight UTC).
double	unix_epoch_mjd () noexcept
	Unix epoch as Modified Julian Day on the UTC axis (40 587.0).
double	julian_year_days () noexcept
	Length of a Julian year in days (365.25 days).
double	utc_defined_from_mjd () noexcept
	UTC MJD from which the UTC time scale is defined (1961-01-01, MJD 37300).
double	gps_epoch_jd_utc () noexcept
	GPS epoch as a Julian Date in UTC (1980-01-06T00:00:00 UTC, JD 2 444 244.5).
double	gps_epoch_jd_tai () noexcept
	GPS epoch as a Julian Date in TAI.
double	gps_epoch_tai_minus_utc_seconds () noexcept
	TAI − UTC offset at the GPS epoch in seconds (19 s).
double	delta_t_prediction_horizon_mjd () noexcept
	MJD beyond which ΔT predictions are no longer reliable (UTC).
double	eop_start_mjd () noexcept
	First MJD covered by the compiled EOP data (UTC).
double	eop_end_mjd () noexcept
	Last MJD covered by the compiled EOP data (UTC).
double	eop_observed_end_mjd () noexcept
	Last MJD for which compiled EOP data is observed (rather than predicted, UTC).
double	modern_delta_t_observed_end_mjd () noexcept
	Last MJD for which modern ΔT observed values are available (UTC).
double	tt_minus_tai_seconds () noexcept
	Constant TT − TAI offset in seconds (32.184 s).
double	nanos_per_second () noexcept
	Number of nanoseconds in one SI second (1e9).
double	iau_time_epoch_t0_jd () noexcept
	IAU time-scale epoch T0 as a Julian Date on the TT axis (1977-01-01 TAI).
double	tdb_tt_model_high_accuracy_start_jd () noexcept
	First JD(TT) of the high-accuracy TDB−TT model validity window.
double	tdb_tt_model_high_accuracy_end_jd () noexcept
	Last JD(TT) of the high-accuracy TDB−TT model validity window.

Function Documentation

delta_t_prediction_horizon_mjd()

double tempoch::constants::delta_t_prediction_horizon_mjd ( )

inlinenoexcept

MJD beyond which ΔT predictions are no longer reliable (UTC).

Definition at line 46 of file constants.hpp.

eop_end_mjd()

double tempoch::constants::eop_end_mjd ( )

inlinenoexcept

Last MJD covered by the compiled EOP data (UTC).

Definition at line 54 of file constants.hpp.

eop_observed_end_mjd()

double tempoch::constants::eop_observed_end_mjd ( )

inlinenoexcept

Last MJD for which compiled EOP data is observed (rather than predicted, UTC).

Definition at line 57 of file constants.hpp.

eop_start_mjd()

double tempoch::constants::eop_start_mjd ( )

inlinenoexcept

First MJD covered by the compiled EOP data (UTC).

Definition at line 51 of file constants.hpp.

gps_epoch_jd_tai()

double tempoch::constants::gps_epoch_jd_tai ( )

inlinenoexcept

GPS epoch as a Julian Date in TAI.

Definition at line 38 of file constants.hpp.

gps_epoch_jd_utc()

double tempoch::constants::gps_epoch_jd_utc ( )

inlinenoexcept

GPS epoch as a Julian Date in UTC (1980-01-06T00:00:00 UTC, JD 2 444 244.5).

Definition at line 35 of file constants.hpp.

gps_epoch_tai_minus_utc_seconds()

double tempoch::constants::gps_epoch_tai_minus_utc_seconds ( )

inlinenoexcept

TAI − UTC offset at the GPS epoch in seconds (19 s).

Definition at line 41 of file constants.hpp.

iau_time_epoch_t0_jd()

double tempoch::constants::iau_time_epoch_t0_jd ( )

inlinenoexcept

IAU time-scale epoch T0 as a Julian Date on the TT axis (1977-01-01 TAI).

Definition at line 71 of file constants.hpp.

j2000_jd_tt()

double tempoch::constants::j2000_jd_tt ( )

inlinenoexcept

J2000.0 epoch as a Julian Date in TT (2 451 545.0).

Definition at line 20 of file constants.hpp.

julian_year_days()

double tempoch::constants::julian_year_days ( )

inlinenoexcept

Length of a Julian year in days (365.25 days).

Definition at line 29 of file constants.hpp.

modern_delta_t_observed_end_mjd()

double tempoch::constants::modern_delta_t_observed_end_mjd ( )

inlinenoexcept

Last MJD for which modern ΔT observed values are available (UTC).

Definition at line 60 of file constants.hpp.

nanos_per_second()

double tempoch::constants::nanos_per_second ( )

inlinenoexcept

Number of nanoseconds in one SI second (1e9).

Definition at line 68 of file constants.hpp.

tdb_tt_model_high_accuracy_end_jd()

double tempoch::constants::tdb_tt_model_high_accuracy_end_jd ( )

inlinenoexcept

Last JD(TT) of the high-accuracy TDB−TT model validity window.

Definition at line 79 of file constants.hpp.

tdb_tt_model_high_accuracy_start_jd()

double tempoch::constants::tdb_tt_model_high_accuracy_start_jd ( )

inlinenoexcept

First JD(TT) of the high-accuracy TDB−TT model validity window.

Definition at line 74 of file constants.hpp.

tt_minus_tai_seconds()

double tempoch::constants::tt_minus_tai_seconds ( )

inlinenoexcept

Constant TT − TAI offset in seconds (32.184 s).

Definition at line 65 of file constants.hpp.

unix_epoch_jd()

double tempoch::constants::unix_epoch_jd ( )

inlinenoexcept

Unix epoch as Julian Date on the UTC axis (1970-01-01 midnight UTC).

Definition at line 23 of file constants.hpp.

unix_epoch_mjd()

double tempoch::constants::unix_epoch_mjd ( )

inlinenoexcept

Unix epoch as Modified Julian Day on the UTC axis (40 587.0).

Definition at line 26 of file constants.hpp.

utc_defined_from_mjd()

double tempoch::constants::utc_defined_from_mjd ( )

inlinenoexcept

UTC MJD from which the UTC time scale is defined (1961-01-01, MJD 37300).

Definition at line 32 of file constants.hpp.