$LastChangedDate: 27-Juil-2011 $

# CL_mod_nutationAngles

Nutation angles (Wahr IAU 1980)

## Calling Sequence

       [NUT,F[,NUTP,FP[,NUTPP,FPP]]]=CL_mod_nutationAngles(jj_tai,sec_tai[,flag])

## Description

- Computes the nutation angles (delta longitude, delta obliquity) according to Wahr nutation theory.

## Parameters

jj_tai :

  (integer) Modified (1950.0) Julian day (1xN)

sec_tai :

  seconds (TAI time scale) (1xN)

flag :

  (optional) "n" -> NUT,F; "p" NUT,F and NUTP,Fp; "s" -> F, Fp, Fpp and NUT,NUTp,NUTPP (default depends on number of output variables)

NUT :

  longitude, obliquity NUT=[DPSI;DEPS] [rad] (2xN)

F :

  fundamentals arguments of nutation [rad] (5xN)

NUTP :

  (optional with FP) first time derivative of NUT [rad/s] (2xN)

NUTPP :

  (optional with FPP) second time derivative of NUT [rad/s^2] (5xN)

FP :

  (optional with NUTP) first time derivative of F [rad/s] (2xN)

FPP :

  (optional with NUTPP) second time derivative of F [rad/s^2] (5xN)

## Authors

- CNES - DCT/SB

## Bibliography

- 1) IERS Conventions (1996), Dennis D. McCarthy

## See also

- CL_mod_nutationArg

## Examples

    jj_tai = [19500:1:20500];
    ss_tai = 43200*ones(jj_tai);
    [NUT,F,NUTP,FP,NUTPP,FPP]=CL_mod_nutationAngles(jj_tai,ss_tai,"s");
    plot(jj_tai'+ss_tai'/86400,NUT');