|
Most people can see 6th magnitude stars on clear nights, now if you look at the coal sack there is a 6th magnitude star in it. When you can see this, you can say you have a limiting magnitude of 6. Now if you cannot see it, then you have above five, so then you have to look for a 5 magnitude star and the same applies. Keep going down until you find the one you can see. So depending on your site, you can determine what the visual limiting magnitude of your site is.
Paul
|