SLA_EQECL

J2000 $α, δ$ to Ecliptic

ACTION:: Transformation from J2000.0 equatorial coordinates to ecliptic longitude and latitude.
CALL:: CALL sla_EQECL (DR, DD, DATE, DL, DB)

DR,DD	D	J2000.0 mean $[α, δ]$ (radians)

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

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