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SLA_NUTC - Nutation Components   

ACTION:
Nutation (IAU 1980 theory): longitude & obliquity components, and mean obliquity.

CALL:
CALL sla_NUTC (DATE, DPSI, DEPS, EPS0)

GIVEN:

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

RETURNED:

DPSI,DEPS D nutation in longitude and obliquity (radians)
EPS0 D mean obliquity (radians)

REFERENCES:
1.
Final report of the IAU Working Group on Nutation, chairman P.K.Seidelmann, 1980.
2.
Kaplan, G.H., 1981. USNO circular no. 163, pA3-6.


next up previous
Next: SLA_OAP - Observed to Apparent
Up: SUBPROGRAM SPECIFICATIONS
Previous: SLA_NUT - Nutation Matrix

SLALIB --- Positional Astronomy Library
Starlink User Note 67
P. T. Wallace
12 October 1999
E-mail:ptw@star.rl.ac.uk