Michael J. Radwin has an interactive Jewish calendar on his site . . . for all those times when you’re trying to figure out if that dentist appointment you’re about to schedule coincides with Yom Kippur. He’s also got a candlelighting time tool and a date converter.
I dunno, stuff like this amuses me. Because it’s so incongruous with the notion of how they used to look at the moon to tell what day it was in ancient times. I really wonder what the sages in the time of the Talmud would have thought of interactive web calendars.
To my way of thinking, they’d have been all for it, on the basis that the Web is a way of disseminating information about when dates fall, but not a way of determining when the dates actually fall.
Interesting, Muslims still do this. Among Jews, apparently the practice was discontinued in the fourth century, which I’d kind of figured but never really known.