Ronn!Blankenship <[EMAIL PROTECTED]> wrote that he created
... charts of the area around the constellation Orion showing what it would look like to each of those (based only on the sensitivity)
I could not figure out how to do this until Ronn reminded me that a
computerized sky chart program enables one to set different limiting magnitudes. I do this all the time in order to compare what I will see in my light polluted area with my naked eye and 50 mm binoculars. Sad to say, I did not include cats and owls in the same thought pattern as sky charts!
To be fair, I'm not sure when I thought of it, either, but I don't think it was the first time I encountered a computerized sky chart program or a cat, either . . .
;-)
Ronn suggested the following limiting magnitudes:
4.5 for a human in a light-polluted area;
That may be pushing it. For someone who doesn't know the sky, 3.5 might be more realistic. For someone living near downtown, 2.5 or even less might be better.
6.5 for a human with a dark sky;
8.3 for a cat with a dark sky, since a cat's eyes are 6 times as sensitive as a human;
11.5 for an owl with a dark sky, since an owl's eyes are 100 times as sensitive as a human.
Did you get the graphic I sent you off-list?
-- Ronn! :)
"Earth is the cradle of humanity, but one cannot remain in the cradle forever." -- Konstantin E. Tsiolkovskiy
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