Seems to be somelike an 'old hat' I posted here. But for the newbies (as me) it's a good hint for fascinating observations. Thanks for the responds and the URLs, especially the one for search and browse the older SeeSat-messages. Johannes Johannes Mueller, Irmtraut/Germany Joh_Mueller@compuserve.com Location: 50d33m15s N, 8d03m33s E, 354m, UT+2