Extraterrestrial
Astronomical Coordinates
This article is requiring no knowledge on Astronomy. It introduces, however, one of the most complicated concepts in astronomy: Astronomical Coordinates. It's then followed by some Glossary for terms including the words in original Arabic from which the English terms stemed and then a final 'test' piece in archaic Arabic by Ibn Khaldoun.
Now, many of those starting to learn Astronomy have a problem understading the difference between Equatorial Coordinates (Right-Ascention and Declination angles) and Horizontal Coordinates (Azimuth and Altitude angles). Here is some help.