TimeConstants.hpp File Reference

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Namespaces
namespace	vulcan
namespace	vulcan::constants
namespace	vulcan::constants::time

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