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Re: [Phys-L] Where is the sky?

In fact, the angular size of the moon is a little smaller near the horizon BOTH because it is generally a little farther away (by something like the radius of the Earth) AND because atmospheric refraction squashes it a little in the direction perpendicular to the horizon.

John Mallinckrodt
Cal Poly Pomona

On Aug 23, 2013, at 1:35 PM, Aburr@aol.com wrote:

But the rising and setting moon does not have a larger angular size.

Alex. F. Burr


In a message dated 8/23/2013 1:14:34 P.M. Mountain Daylight Time,
bnettles@uu.edu writes:

I haven't done it, but I expect that the spectral measurement of moonlight
from a rising and setting moon will be much "redder" than the overhead
moon, but the larger angular size causes the light to be coming through a more
diffuse path and so the redness isn't as pronounced

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