I'm sure others have noticed this but I don't recall anyone posting anything about it. I have found that by just scanning a list of upcoming visible Iridium passes, I can generally pick out the passes that will produce bright flares. For me, the morning S-->N passes that pass 0-10 deg east of Polaris and the evening N-->S passes that pass a little east of south (Jupiter provides a nice reference at present) will flare centered around 35-40 deg elevation. I don't know if this rule-of-thumb accounts for all the non-daylight passes I could see, but the ones I have seen all fit this pattern. Robert Fenske, Jr. firstname.lastname@example.org Sw |The Taming the C*sm*s series: Southwest Research Institute /R---\ | Signal Exploitation & Geolocation Div | I | |"The Martian canals were the San Antonio,Texas USA ph:210-522-3931 \----/ | Martians' last ditch effort."