SUBROUTINE NOD VERSION 2. IN LOW-ACCURACY MODE, THIS SUBROUTINE EVALUATES A SHORT NUTATION SERIES AND RETURNS APPROXIMATE VALUES FOR NUTATION IN LONGITUDE AND NUTATION IN OBLIQUITY FOR A GIVEN TDB JULIAN DATE. IN THIS MODE, ONLY THE LARGEST 13 TERMS OF THE IAU 2000A NUTATION SERIES ARE EVALUATED. IN HIGH-ACCURACY MODE, THE STANDARD IERS SUBROUINE IS CALLED TO EVALUATE THE FULL IAU 2000A NUTATION SERIES.
T = TDB TIME IN JULIAN CENTURIES SINCE J2000.0 (IN)
DPSI = NUTATION IN LONGITUDE IN ARCSECONDS (OUT)
DEPS = NUTATION IN OBLIQUITY IN ARCSECONDS (OUT)
NOTE: IN LOW-ACCURACY MODE, MAX ERROR IN DPSI < 0.05 ARCSEC, MAX ERROR IN DEPS < 0.02 ARCSEC, AVERAGE ERROR ABOUT 1/4 OF MAX.
| Type | Intent | Optional | Attributes | Name | ||
|---|---|---|---|---|---|---|
| double precision | :: | t | ||||
| double precision | :: | dpsi | ||||
| double precision | :: | deps |