On Sun 2010-12-12T20:48:48 -0700, Warner Losh hath writ: [regarding a 10 year advance predicion of leaps] > It does seem like a reasonable compromise between different needs. It > would preserve the low-precision users (like PHP) to be more or less as > accurate as they are today without modification, while not affecting the > high precision users over much since they need DUT1 today anyway
I agree. I suppose that the php API in the orgin of this thread is expected to be used on web pages related to Jewish, Muslim, Adventist needs to schedule events with respect to sunset. I can say with experience http://www.ucolick.org/~sla/sunset/ that meteorology can cause the predictions of sunset and sunrise times to be off by minutes. So a multi-year window of leap second prediction will not notably degrade the current accuracy of this php API. The bigger picture is whether the ITU-R will redefine the civil notion of the word "day" to be based solely on cesium atoms, and unrelated to the passage of the sun across the sky. -- Steve Allen <[email protected]> WGS-84 (GPS) UCO/Lick Observatory Natural Sciences II, Room 165 Lat +36.99855 University of California Voice: +1 831 459 3046 Lng -122.06015 Santa Cruz, CA 95064 http://www.ucolick.org/~sla/ Hgt +250 m _______________________________________________ LEAPSECS mailing list [email protected] http://six.pairlist.net/mailman/listinfo/leapsecs
