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Re: [OM] Astrophotography

Subject: Re: [OM] Astrophotography
From: "John A. Lind" <jlind@xxxxxxxxxxx>
Date: Sun, 12 Aug 2001 12:08:19 +0000
At 15:19 8/12/01, Chris O'Neill wrote:
Sets: 15:22+0.1°

Uhhhh....  I have no idea how to interpret that???  Surely the moon
doesn't set at 3:22 in the afternoon???

Help!!!

Thanks!

Regards,

Chris

Ummm, yes it does! Follow the moon some time around 3/4 disc illumination on each side of when it is full. You can see it in the sky opposite the sun during broad daylight.

The time is given for 1 degree above "horizontal" (a plane tangent to your location) and that's what the degrees after the time mean. Sunrise and sunset are often given in a fraction of a degree below the tangent plane because of its brightness and refraction through the Earth's atmosphere.

-- John


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