Hmm... it's a bit harder when the moon is nearly full. We stop looking for nice transitions along the terminator and start to look for any contrast at all.
Oh well - sorry about the size: 1280px ... and the noise....it's hard to smoothly get a 1280px image down to 200kb! Hopefully I'll get time and see if I can re-do it tomorrow... and take up Mike's offer to store the hi-res.