palEqecl
palEqecl
- Transform from J2000.0 equatorial coordinates to ecliptic coordinates
- Description:
- Transform from J2000.0 equatorial coordinates to ecliptic coordinates.
- Invocation:
- void palEqecl( double dr, double dd, double date,
double
dl, double
db);
- Arguments:
-
-
dr = double (Given)
-
J2000.0 mean RA (radians)
-
dd = double (Given)
-
J2000.0 mean Dec (Radians)
-
date = double (Given)
-
TT as Modified Julian Date (JD-2400000.5). The difference
between TT and TDB is of the order of a millisecond or two
(i.e. about 0.02 arc-seconds).
-
dl = double
(Returned)
-
Ecliptic longitude (mean of date, IAU 1980 theory, radians)
-
db = double
(Returned)
-
Ecliptic latitude (mean of date, IAU 1980 theory, radians)