Mr. Eclipse, hosted by Fred Espenak, is your go-to page for this. The data for both solar and lunar eclipse events seems to be accurate based on my experience of past events.
http://www.eclipsewise.com/lunar/LEprime/2001-2100/LE2019Jan21Tprime.html ---- Mark Sims <hol...@hotmail.com> wrote: > While on the subject of the accuracy/reliability of various algorithms and > web pages showing various astronomical data, we had a full moon / total lunar > eclipse in the northern hemisphere. And not just any full moon, but a Super > Blood Werewolf Zombie Apocalypse full moon (or some such drivel spouted by > all the TV stations). Anyway, I wanted to know when the eclipse was at it's maximum. Most web sites gave a time here as 23:12, some differed by several minutes. None gave the time to the second. That just won't do for a moon worshiping time-nut, will it? So, I tricked up a version of Lady Heather to do a screen dump when the difference of the sun and moon azimuth and elevation were at a (180 degree) minimum. Looks like it happened at 23:12:04 Heather's sun position code (based on Grena's algorithm 5) is VERY accurate (and quite simple). The moon position code is pretty good... a better version would require several thousand lines of code evaluating a zillion polynomials with hundreds of terms. Anyway,, attached is a copy of the screen dump. Note the difference in the sun/moon az/el values and also the calculated moon phase. Does anybody know of a reliable source of the true time of the lunar eclipse down to the second (or better)? _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.
