SLA_EQECL - J2000 $\alpha,\delta$ to Ecliptic

ACTION:

Transformation from J2000.0 equatorial coordinates to ecliptic longitude and latitude.

CALL:

CALL sla_EQECL (DR, DD, DATE, DL, DB)

GIVEN:

$$[\,\alpha,\delta\,]$$ DR,DD

DATE D TDB (formerly ET) as Modified Julian Date (JD-2400000.5)

RETURNED:

DL,DB ecliptic longitude and latitude (mean of date, IAU 1980 theory, radians)