thanks for the link, but looking around the site i'm confused/lost - it's not exactly user friendly!You could try www.astrospace.co.uk
Well, you don't want clouds on the nights when you're shooting. But unless you go somewhere like the Atacama Desert or the top of a very high mountain (ie where all the big astronomical observatories are!), you just have to pick nights when it's clear. The weather forecast is your friend.location wise, I'm assuming somewhere without cloud?