vulcan::constants::time Namespace Reference

Variables
constexpr double	JD_J2000 = 2451545.0
	Julian Date of J2000.0 epoch (2000-01-01 12:00:00 TT).
constexpr double	MJD_J2000 = 51544.5
	Modified Julian Date of J2000.0.
constexpr double	MJD_OFFSET = 2400000.5
	Julian Date offset: JD = MJD + MJD_OFFSET.
constexpr double	JD_GPS_EPOCH = 2444244.5
	Julian Date of GPS epoch (1980-01-06 00:00:00 UTC).
constexpr double	JD_UNIX_EPOCH = 2440587.5
	Julian Date of Unix epoch (1970-01-01 00:00:00 UTC).
constexpr double	JD_J1900 = 2415020.0
	Julian Date of J1900.0 (1899-12-31 12:00:00 UT).
constexpr double	TT_TAI_OFFSET = 32.184
	TT - TAI offset [s] (exact, by definition).
constexpr double	GPS_TAI_OFFSET = -19.0
	GPS - TAI offset [s] (exact: GPS = TAI - 19s at GPS epoch).
constexpr double	TAI_GPS_OFFSET = 19.0
	TAI - GPS offset [s].
constexpr double	SECONDS_PER_DAY = 86400.0
	Seconds per day.
constexpr double	SECONDS_PER_CENTURY = 86400.0 * 36525.0
	Seconds per Julian century.
constexpr double	DAYS_PER_CENTURY = 36525.0
	Days per Julian century.
constexpr double	DAYS_PER_YEAR = 365.25
	Days per Julian year.
constexpr double	SECONDS_PER_WEEK = 604800.0
	Seconds per week (for GPS).
constexpr double	JD_TOLERANCE = 1.0e-11
	Tolerance for Julian Date comparisons [days] (~1 microsecond).
constexpr double	TIME_TOLERANCE = 1.0e-9
	Tolerance for time comparisons [seconds] (~1 nanosecond).

Variable Documentation

DAYS_PER_CENTURY

double vulcan::constants::time::DAYS_PER_CENTURY = 36525.0

inlineconstexpr

Days per Julian century.

DAYS_PER_YEAR

double vulcan::constants::time::DAYS_PER_YEAR = 365.25

inlineconstexpr

Days per Julian year.

GPS_TAI_OFFSET

double vulcan::constants::time::GPS_TAI_OFFSET = -19.0

inlineconstexpr

GPS - TAI offset [s] (exact: GPS = TAI - 19s at GPS epoch).

JD_GPS_EPOCH

double vulcan::constants::time::JD_GPS_EPOCH = 2444244.5

inlineconstexpr

Julian Date of GPS epoch (1980-01-06 00:00:00 UTC).

Examples

/home/runner/work/vulcan/vulcan/include/vulcan/time/Epoch.hpp.

JD_J1900

double vulcan::constants::time::JD_J1900 = 2415020.0

inlineconstexpr

Julian Date of J1900.0 (1899-12-31 12:00:00 UT).

JD_J2000

double vulcan::constants::time::JD_J2000 = 2451545.0

inlineconstexpr

Julian Date of J2000.0 epoch (2000-01-01 12:00:00 TT).

Examples

/home/runner/work/vulcan/vulcan/include/vulcan/time/Epoch.hpp.

JD_TOLERANCE

double vulcan::constants::time::JD_TOLERANCE = 1.0e-11

inlineconstexpr

Tolerance for Julian Date comparisons [days] (~1 microsecond).

JD_UNIX_EPOCH

double vulcan::constants::time::JD_UNIX_EPOCH = 2440587.5

inlineconstexpr

Julian Date of Unix epoch (1970-01-01 00:00:00 UTC).

MJD_J2000

double vulcan::constants::time::MJD_J2000 = 51544.5

inlineconstexpr

Modified Julian Date of J2000.0.

MJD_OFFSET

double vulcan::constants::time::MJD_OFFSET = 2400000.5

inlineconstexpr

Julian Date offset: JD = MJD + MJD_OFFSET.

SECONDS_PER_CENTURY

double vulcan::constants::time::SECONDS_PER_CENTURY = 86400.0 * 36525.0

inlineconstexpr

Seconds per Julian century.

Examples

/home/runner/work/vulcan/vulcan/include/vulcan/time/Epoch.hpp.

SECONDS_PER_DAY

double vulcan::constants::time::SECONDS_PER_DAY = 86400.0

inlineconstexpr

Seconds per day.

Examples

/home/runner/work/vulcan/vulcan/include/vulcan/time/Epoch.hpp.

SECONDS_PER_WEEK

double vulcan::constants::time::SECONDS_PER_WEEK = 604800.0

inlineconstexpr

Seconds per week (for GPS).

Examples

/home/runner/work/vulcan/vulcan/include/vulcan/time/Epoch.hpp.

TAI_GPS_OFFSET

double vulcan::constants::time::TAI_GPS_OFFSET = 19.0

inlineconstexpr

TAI - GPS offset [s].

Examples

/home/runner/work/vulcan/vulcan/include/vulcan/time/Epoch.hpp.

TIME_TOLERANCE

double vulcan::constants::time::TIME_TOLERANCE = 1.0e-9

inlineconstexpr

Tolerance for time comparisons [seconds] (~1 nanosecond).

TT_TAI_OFFSET

double vulcan::constants::time::TT_TAI_OFFSET = 32.184

inlineconstexpr

TT - TAI offset [s] (exact, by definition).

Examples

/home/runner/work/vulcan/vulcan/include/vulcan/time/Epoch.hpp.