SLA_ECMAT

Form $\alpha ,\delta \to \lambda ,\beta$ Matrix

ACTION:

Form the equatorial to ecliptic rotation matrix (IAU 1980 theory).

CALL:

CALL sla_ECMAT (DATE, RMAT)

GIVEN:

RETURNED:

NOTES:

(1)

RMAT is matrix M in the expression v${}_{ecl}$ = M$\cdot$v${}_{equ}$.

(2)

The equator, equinox and ecliptic are mean of date.

REFERENCE:

Murray, C.A., Vectorial Astrometry, section 4.3.