functions in kepler.i - s



Keyword,  defined at i/kepler.i   line 220  

SEE sch_planets  


    sch_planets, sch_moon  

from "How to compute planetary positions",  
by Paul Schlyter of Stockholm, Sweden  
"Please note that the orbital elements of Uranus and Neptune as given  
here are somewhat less accurate.  They include a long period perturbation  
between Uranus and Neptune.  The period of the perturbation is about  
4200 years."  
After corrections in the case of the moon, jupiter, saturn, and uranus,  
these are claimed to be accurate to under 1 arc minute for the inner  
planets, about 1 arc minute for the outer planets, and 2 arc minutes  
for the moon.  
   Keyword,  defined at i/kepler.i   line 220  



    xyz = moon(time)  

return position XYZ of the moon relative to center of earth  
at TIME; the XYZ has leading dimension 3; x is along the vernal  
equinox, z is ecliptic north.  Corrections due to Schlyter (see  
sch_planets) are applied.  Claimed accurate to under 1 arc minute  
over some reasonable time.  TIME is in days since 0/Jan/00 (that is,  
0000 UT 31/Dec/99).  This is 1.5 days earlier than the J2000 epoch.  
Interpreted function, defined at i/kepler.i   line 342  

SEE ALSO: solar_system,   sch_moon,   kepler