Re: First Views with an Older C90
From: Tony Flanders (tony_flanders_at_yahoo.com)
Date: 11/21/04
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Date: 21 Nov 2004 08:08:08 -0800
davyjo@adelphia.net (davyjo) wrote in message news:<cfd14e4.0411192109.1804c2bf@posting.google.com>...
> I do have one question. What kind of filter do I need to better see
> the moon? The edge of the light was beautiful but the rest of the moon
> was washed out.
No filter will change that; it's a fundamental fact of lunar observing.
Features show most clearly along the terminator, the line between light
and dark, because the Sun is at a low angle (from the lunar point of
view) and casts long shadows. Far from the terminator, the Sun is more
nearly overhead, and there aren't any shadows to see. 90% of lunar
observing is looking at shadows.
However, there are interesting things to see far from the terminator.
There are subtle variations in hue and brightness, most obviously
the dark of the lunar mare, which are best seen when the Sun is high.
Rays, like the ones emanating from Tycho, reflect light preferentially
back toward the source, and are most obvious when the Sun is overhead.
And a few of the young craters are surrounded by aprons of white
material.
Mostly, though, you wait for the terminator to cross the area of
interest -- it does so twice a month. And there's always more than
enough to keep you interested right along the terminator wherever
it is -- except at full Moon, when it lies on the Moon's edge.
- Tony Flanders
- Next message: Howard Lester: "Re: Stelllarvue Nighthawk vs Orion 80mm ED"
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- In reply to: davyjo: "First Views with an Older C90"
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