Hello All,
Jorge sends us the equation for determining the mean obliquity
of the ecliptic as given in Astronomical Algorithms, J Meeus, [21.2]. A
more accurate equation is given in [21.3]. Also, to determine the true
obliquity, the nutation in obliquity must be incorporated. The parameter
T is the number of /*centuries*/ from J2000.0, (Julian Days begin at
noon UT).
Regards,
Luke
Jorge Ramalho wrote:
> Achim, A expressao que dah o valor medio da obliquidade da
> ecliptica eh 23d 26' 21.45'' - 46.815'' *T - 0.0006'' *T^2 +
> 0.00181*T^3 T eh o numero de seculos Julianos para ou desde a epoca
> 2000 Jan 1.5(Dia Juliano 2 451 545.0) jorge
