of a 30-cm diameter horizontal dial. It's inscribed "R. Glynne fecit"
and the equation of time table gives evidence that it's on the Julian
calendar, which England did not abandon until 1752. Measuring the
gnomon angle, I derive a design latitude of 54.3 deg, and from the
angles of the hourlines, I get a design latitude of 52.5 deg (plus or
minus 1 deg). This latter is consistent with London at 51.5 deg
latitude.
Does anyone know of the provenance of the original, which was
apparently made by Mr. Glynne in England in the early 18th or late
17th c?
Thanks and with best wishes to all for a peaceful 2004,
Woody Sullivan
******************************************************************
Prof. Woodruff T. Sullivan, III Center for Astrobiology & Early Evolution
Dept. of Astronomy Box 351580
Univ. of Washington tel. 206-543-7773
Seattle, WA 98195 USA fax 206-685-0403
-
