A small correction - it actually is frequent - about twice each lunation, but it is only visible at a reasonable hour (like now) about 3 or 4 times a year.
I had a look with my cheap 7x50 binos from the front yard but can't see what you're referring to. Dob's in the back yard & can't see the Moon from there. It's very low in the sky already. Is tomorrow night (or 28 days from tonight) too late to see this crater in the twilight zone?
[i]Originally posted by janoskiss I had a look with my cheap 7x50 binos from the front yard but can't see what you're referring to. Dob's in the back yard & can't see the Moon from there. It's very low in the sky already. Is tomorrow night (or 28 days from tonight) too late to see this crater in the twilight zone?
A telescope does provide a much better view with a higher magnification and narrower field of view. Not that there is anything wrong with Binoculars - I could happily spend the rest of my life exploring the Milky Way with them, but you need more for this. Tomorrow night is too late for Alphonsus - next chance 16 May. Of course the Moon always looks great, anyway.