Importance of Astronomy Weather Balanced seasons Clear nights Climate diversity Our region is rich with history in astronomy Astronomy include all sides of science, physics, chemistry, math, and biology.
Astronomy in the Arab world Astronomy is still behind. Lack of astrophotographers in the region. There are observatories, but for research like in Lebanon, Egypt and Morocco
Objects in the sky The sun The moon The planets Star clusters Nebulas Galaxies
Channels
What is Flux Flux is number of particles crossing the channel in time dt. The paramters are We have two systems, high ( ) and low ( ) values are ( ) values are ( )