Name
CL_mod_meanObliquity — Mean obliquity (IERS 1996)
Calling Sequence
[eps0[,eps0p[,eps0pp]]]=CL_mod_meanObliquity(jj_tai,sec_tai[,flag])
Description
-
Calculate mean obliquity (IERS 1996) and its time derivatives
- standards IERS 1996
- Last update : 27/03/2007
Parameters
- jj_tai :
CNES Julian day (TAI time) (1xN)
- sec_tai :
seconds (TAI time) (1xN)
- flag :
(optional) "p" -> eps0 and eps0p; "s" -> eps0,eps0p and eps0pp (default depends on number of outputs)
- eps0:
mean obliquity [rad] (1xN)
- eps0p:
(optional) first time derivative of eps0 [rad/s] (1xN)
- eps0pp:
(optional) second time derivative of eps0 [rad/s^2] (1xN)
Bibliography
1 IERS Conventions (1996), Dennis D. McCarthy
2 Explanatory Supplement to the Astronomical Almanac, Seidelman (1992)
Examples
jj_tai = [19500:1:20500];
ss_tai = 43200*ones(jj_tai);
[eps0,eps0p,eps0pp]=CL_mod_meanObliquity(jj_tai,ss_tai,"s"); //calcul de l'obliquité moyenne
plot(jj_tai'+ss_tai'/86400,eps0'*180/%pi);