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)

Authors

CNES - DCT/SB

Bibliography

1 IERS Conventions (1996), Dennis D. McCarthy

2 Explanatory Supplement to the Astronomical Almanac, Seidelman (1992)

See also

CL_mod_nutationAngles, CL_mod_nutationArg, CL_mod_precessionAngles

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);