Una aplicacion interessante para los Oregon
http://www.wherigo.com/cartridge/detail ... 71f3751b28
http://www.igrib.de/astrotoolbox/programm.html (En aleman, con pantallas)
This is a little planetarium for the brightest (Mag 2.0 an better) stars and planets. It includes the refraction of atmosphere and the dip of the sea-horizon for astro-navigational purposes.
The mean error of the ephemerides should be smaller then 2.5 arcsec for the next 100 years (11 arcsec for Jupiter an Saturn).
Pictures from the planets, the sun and the moon was taken from the NASA website.