It seems that the naked eye limiting magnitude of a star (anyway) in daylight, under perfect conditions and high altitude, is magnitude -1. See the article, "On the Visibility of Sirius in Daylight," here: http://articles.adsabs.harvard.edu//full/seri/JBAA./0094//0000221.000.html So, I would assume that if a person looked at a far from the sun lunar transit (or near miss) of the ISS, that the ISS might be visible, especially in the future. If one had a descent way of setting a scope to a particular coordinate, the scope could be lined up and low power used to try to catch a glimpse of the ISS any time and anywhere during the day. If I wasn't concerned about my telescope disappearing from the time I line it up at night to the next day, I would try it. For knowing exactly where to look for daytime iridium flares I made a device that is a tube with two parallel eyebolts on it. The night before I line it up on the exact part of the sky the flare is going to occur in then I leave it till daylight the next day. It only requires that I lay on my back to align the two eyebolts and be there to use it when the flare occurs. I myself have observed lunar occultations of Jupiter and Saturn in full daylight using binoculars and a 5 inch scope with various magnifications. Tom Iowa USA ------------------------------------------------------------------------- Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive: http://www.satobs.org/seesat/seesatindex.html
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