Re: [Leica] Measured Reaction Time / Marvin / Alf / Dave

[Chandos Michael Brown <cmbrow@mail.wm.edu>]

For what it's worth, I read an article on this phenomenon in -Scientific
American- back in the early seventies.  I can't offer the citation, but
doubtless FirstSearch would kick it out.  As I recollect, the
physics/optical effects are quite complicated, but I think that the post
below catches the gist of it.

Chandos Michael Brown



At 11:50 AM 4/7/98 -0400, you wrote:
>Alan,
>Interesting thought, that. About the diffeerence in height- I'll have to try
>it.
>I have seen the green flash, both at sunrise and sunset, while at sea on an
>aircraft carrier during my stint in the Nav- we were very used to arising
>early in those days!
>I asked an astronomer at the university about it and his explanation is that
>the refraction of the sun's rays around the edge of the earth, and through
>the atmosphere, acts like a large prism. the red is bent the most so you see
>the red in the sunrise first. As the sun rises, the angle of this 'prism'
>changes, rotating in effect, and as it 'turns' the band of light with the
>green portion of the spectrum flashes. More often than not, I have blinked
>and missed it, but it is fun trying to catch the 'moment'- never though how
>to do it on film, however.
>Dan'l
>
>dwpost@msn.com
>-----Original Message-----
>From: Alan Hull <hull@vaggeryd.mail.telia.com>
>To: leica-users@mejac.palo-alto.ca.us <leica-users@mejac.palo-alto.ca.us>
>Date: Tuesday, April 07, 1998 10:46 AM
>Subject: Re: [Leica] Measured Reaction Time / Marvin / Alf / Dave
>