$LastChangedDate: 27-Juil-2011 $

# CL_mod_nutationArg

Fundamental arguments for nutation

## Calling Sequence

       [F[,FP[,FPP]]]=CL_mod_nutationArg(t[,flag])

## Description

- Computes the fundamental arguments for nutation (F) (Sun and Moon position), and their derivatives (FP,FPP).

  F(1,:) -> l = Mean Anomaly of the Moon

  F(2,:) -> l' = Mean Anomaly of the Sun

  F(3,:) -> F = L - OMEGA (where L is the mean longitude of the moon)

  F(4,:) -> D = Mean Elongation of the Moon from the Sun

  F(5,:) -> OMEGA = Mean Longitude of the Ascending Node of the Moon

## Parameters

t :

  Time from 1st January 2000 12h in centuries (number of days / 36525), (TT time scale) (1xN)

flag :

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

F :

  Fundamental arguments for nutation (5xN) [rad]

FP :

  (optional) First time derivative of F (5xN) [rad/s]

FPP :

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

## Authors

- CNES - DCT/SB

## Bibliography

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

## See also

- CL_mod_nutationAngles

## Examples

    t=-0.05:0.001:0.05;
    [F,FP,FPP]=CL_mod_nutationArg(t,"s")