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Old 22-07-2018, 06:50 PM
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OzEclipse (Joe Cali)
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Join Date: Jun 2012
Location: Young Hilltops LGA, Australia
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Quote:
Originally Posted by AstralTraveller View Post
I'm trying to work out whether to observe from my back yard or travel. The first is easier of course but the western horizon is partially obstructed. The question is: how low will the moon be when it disappears into the twilight? From Joe's diagram it appears it could be as low as 5 degrees. Anyone have any idea? [I have seen a rising eclipse but that was over the ocean and I have no memory of how high it was when we first spotted it.]
David

It depends on local aerosols and other particulates in the air that might increase(by scatter) or decrease(by absorption) the brightness of the sky and contribute to extinction of the Moon. The moon will darken to midtotality then brighten to the end of totality at sunrise.

I'd suggest it isn't really possible to predict.

Once twilight arrives and sky brightness starts being comparable to the moon, all you need to do is switch your camera to Av mode and let it happen.
Even if the moon disappears, keep shooting, it might reappear as the Moon brightens.

Joe
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