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Fundamental constants for time-scale conversions, relativistic corrections, and astronomical calculations.
Constants§
- ATTOS_
PER_ DAY - ATTOS_
PER_ FS - Attoseconds per femtosecond (10⁻¹⁵ s).
- ATTOS_
PER_ FS_ I128 - Attoseconds per femtosecond (10⁻¹⁵ s).
- ATTOS_
PER_ HALF_ DAY - ATTOS_
PER_ HALF_ DAYU - ATTOS_
PER_ MS - Attoseconds per millisecond (10⁻³ s).
- ATTOS_
PER_ MS_ I128 - Attoseconds per millisecond (10⁻³ s).
- ATTOS_
PER_ NS - Attoseconds per nanosecond (10⁻⁹ s).
- ATTOS_
PER_ NS_ I128 - Attoseconds per nanosecond (10⁻⁹ s).
- ATTOS_
PER_ PS - Attoseconds per picosecond (10⁻¹² s).
- ATTOS_
PER_ PS_ I128 - Attoseconds per picosecond (10⁻¹² s).
- ATTOS_
PER_ SEC - Attoseconds per second.
- ATTOS_
PER_ SECF - ATTOS_
PER_ SEC_ I128 - ATTOS_
PER_ SEC_ U128 - ATTOS_
PER_ US - Attoseconds per microsecond (10⁻⁶ s).
- ATTOS_
PER_ US_ I128 - Attoseconds per microsecond (10⁻⁶ s).
- C
- Speed of light in m/s (SI definition)
- C_
SQUARED - Speed of light squared (c²) in m² s⁻².
- GM_SUN
- Solar gravitational parameter GM☉ in m³ s⁻²
(nominal value from IAU 2015 Resolution B3) - GM_
SUN_ OVER_ C3 - GM☉ / c³ in seconds (from
GM_SUNandC— used in Shapiro delay) - JD_
2000_ 2_ 451_ 545 - Julian Date of the J2000.0 epoch.
- JD_
2000_ 2_ 451_ 545F - MJD_
1970 - MJD 40587.0 = 1970-01-01 00:00:00 UTC
- PLANCK_
LENGTH - PLANCK_
LENGTH_ 4 - SEC_
PER_ DAYI64 - SEC_
PER_ DAY_ F - 86,400 seconds in one standard Earth day
(24 hours × 60 minutes × 60 seconds). - STRFTIME_
SIZE - TAI_
SEC_ AT_ 1972 - Number of TAI seconds backwards from noon 2000-01-01 to midnight 1972-01-01
- TT_
TAI_ OFFSET - Helper that returns the TT–TAI offset as a
Dt. - TWO_
GM_ SUN_ OVER_ C3 - 2GM☉ / c³ — the standard prefactor in the one-way Shapiro delay formula