Re: Red or green laser?

From: JOHN PAZMINO (john.pazmino_at_relaynet.org)
Date: 01/24/05 

Date: Sun, 23 Jan 2005 22:47:22 -0400

CL> From: Chris L Peterson <clp@alumni.caltech.edu>
CL> Subject: Re: Red or green laser?
CL> Date: Thu, 20 Jan 2005 15:10:34 GMT
CL>
CL> >baloney! I and many others have been using red lasers at night for years _
CL> >and the public sure sees them point at celestial objects _
CL> >
CL> >Yes the green is easier to see - significantly easier to see. But to say
CL> >the red
CL> >lasers cant be seen is total nonsense.
CL>
CL> I feel sorry for you, living under such miserable atmospheric conditions that a
CL> <5mW red laser makes an effective pointer to celestial objects! But for anyone
CL> living where the air is fairly clean, you really do need a green source if you
CL> hope for people to see much. If it is very clean and dry (as where I live) even
CL> the green laser is hard to see for anyone more than a few feet from the source.

    In the age before laser pointers I and other astronomers worked
star viewings at Jones Beach, Long Island. There we pointed out the
stars with an automobile headlight! The lamp was loose to hol din the
hands ans aim at the sky. That beam was so, erm, brilliant! In fact,
for any fainter star, we had to aim off of it, wlse the star would be
seamped. Or we drew a circle around it and told the visitors to look
at the center of the circle.
    Jones Beach is on the south shore of Long Island, right smack in
the airlane of Kennedy airport to the west. Planes regularly flew over
or along the shore all night long.
    You may recall that the Air France flight that somehow exploded
off of the Moriches, flew tight next to Jones Beach. 

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