20 Mar
2006
20 Mar
'06
1:24 p.m.
--- Chuck Hards <chuckhards@yahoo.com> wrote:
Kurt, are you familiar with polarization-type sundials? They work even on overcast days, . . . I've read that the Vikings used crystals with polarizing properties to estimate solar altitudes and azimuths when at sea, on overcast days. . . .
Thanks, Chuck. No I hadn't heard of that one. I'll put in on my list of things to do. Thanks for pointing it out. - Canopus56 (Kurt) __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com