Philip P. Pappas, II wrote: > > Hi guys, it's me again: > > Just thought of another fun experiment we can do during the Jan. 31 lunar > eclipse. One person wrote saying that he doubted there would be enough > light during a prenumbral eclipse to cast a shadow on a sundial. If you > have a photometer, you could measure the minimum amount of light in > foot-candles (or lumens) that is needed to cast a shadow. You can also note > how far into the eclipse this occurs. I realize that results should vary > depending on local ambient light pollution. > > Knowing, in foot-candles, the minimum amount of light needed to activate a > sundial, how far away from the sun would you have to go until the sun > doesn't cast a shadow? > > John Carmichael
Hello John, I think it was me who said : he doubted there would be enough light during a prenumbral eclipse to cast a shadow on a sundial. Not in this sence. I meant that at your location at 9:18 in the morning you will not see the moon at all because the moon will be beneath the horizon. Only where at that time the moon will be visible the experiment can be done. Fer.
