SLA_ECMAT
Form
Matrix
-
ACTION:
- Form the equatorial to ecliptic rotation matrix (IAU 1980 theory).
-
CALL:
CALL sla_ECMAT (DATE, RMAT)
GIVEN:
DATE | D | TDB (formerly ET) as Modified Julian Date
(JD2400000.5) |
|
RETURNED:
RMAT | D(3,3) | rotation matrix |
|
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NOTES:
-
-
(1)
- RMAT is matrix M in the expression v = Mv.
-
(2)
- The equator, equinox and ecliptic are mean of date.
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REFERENCE:
- Murray, C.A., Vectorial Astrometry, section 4.3.