Jim Morrison wrote: > > Does anyone out there in sundial land have a source that gives the > circumstances of lunar eclipses in 1582? I am trying to help a young man > with a project related to efforts to determine the longitude of Mexico City > in that time period. We need an eclipse that is visible in both Madrid and > Mexico city around 1582. > > Thanks. > > Jim > > James E. Morrison > Astrolabe web pages at: http://myhouse.com/mc/planet/astrodir/astrolab.htm
Hi James, 17 November 1584. Maximum of lunar eclipse at 23:58 UT. A dark moon is rising at Mexico. At the end of the eclipse the moon at Mexico is above the horizon and could be visible. At Madrid the moon is high in the sky and also could be visible. This will work for longitudes for Mexico of about 100 W or smaller . I used Redshift 2 to find out this date and time. Best wishes, Fer. -- Fer J. de Vries [EMAIL PROTECTED] http://www.iaehv.nl/users/ferdv/ lat. 51:30 N long. 5:30 E
