--- Chuck Hards <chuckhards@yahoo.com> wrote:
Kurt, are you familiar with polarization-type sundials? <snip>
Offline, Chuck wrote further - --- Chuck Hards <chuckhards@yahoo.com> wrote:
Vikings and Polarization Sundials Bradley E Schaefer; Sky & Telescope; May 1997; 91 <snip>
BTW, this is the same Dr. Schaefer who, while with JPL/NASA in the 1990s, wrote the code for computing stellar telescopic limiting magnitude and skybrightness that is built into most modern planetarium programs. Schaefer, B.E. Feb. 1990. Telescopic Limiting Magnitude. PASP 102:212-229http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=1990PASP..102..212S In the late 1980s and early 1990s he wrote several S&T articles and published BASIC programs in S&T on those topics. Schaefer got his P.Hd at MIT and is now Lousiana State University. << http://www.phys.lsu.edu/dept/direct/schaefer.html >> Schaefer is also the guy who shook up the January 2006 American Astronomical Society meeting with his plot of the redshifts of distant gamma ray bursts that implies that expansion of the universe is accelerating. Schaefer, B. 1/11/2006. The Hubble Diagram to z=6.3 with Swift Gamma Ray Bursts. http://www.phys.lsu.edu/GRBHD/ If his GRB diagram proves up, he may be in line for a Nobel prize, which is fine by me considering all that he contributed to amateur astronomy. - Canopus56(Kurt) __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com