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Constants
Constantsยง
- AULT
- Light time for 1 au (s)
- CMPS
- Speed of light (m/s)
- D2PI
- 2Pi
- D1900
- J2000.0-B1900.0 (2415019.81352) in days
- DAS2R
- Arcseconds to radians
- DAU
- Astronomical unit (m, IAU 2012)
- DAYSEC
- Seconds per day
- DC
- Speed of light (au per day)
- DD2R
- Degrees to radians
- DJ00
- Reference epoch (J2000.0), Julian Date
- DJC
- Days per Julian century
- DJM
- Days per Julian millennium
- DJM0
- Julian Date of Modified Julian Date zero
- DJM00
- Reference epoch (J2000.0), Modified Julian Date
- DJM77
- 1977 Jan 1.0 as MJD
- DJY
- Days per Julian year
- DMAS2R
- Milliarcseconds to radians
- DPI
- Pi
- DR2AS
- Radians to arcseconds
- DR2D
- Radians to degrees
- DS2R
- Seconds of time to radians
- DTY
- Length of tropical year B1900 (days)
- ELB
- L_B = 1 - d(TDB)/d(TCB), and TDB (s) at TAI 1977/1/1.0
- ELG
- L_G = 1 - d(TT)/d(TCG)
- GRS80
- IYMIN
- Earliest year allowed (4800BC)
- MTAB
- Month lengths in days
- SRS
- Schwarzschild radius of the Sun (au)
- TDB0
- TTMTAI
- TT minus TAI (s)
- TURNAS
- Arcseconds in a full circle
- WGS72
- WGS84
- Reference ellipsoids