On Thu, 20 Jan 2011, Brad Lufkin wrote: > I think having the JDN change at noon UTC avoids a lot of confusion. > Consider this: when is Thursday midnight? Is it the instant between > Wednesday and Thursday or the instant between Thursday and Friday? With the > current definition, it's crystal clear when the JDN changes: Thursday noon > is unambiguous.
JDNs don't actually fix the ambiguity with the phrase "midnight on Thursday". They just give you a new unambiguous notation, except when you get loose and say "noon on JD 2455582". There are other notations that are more familiar than JDNs but still unambiguous, such as "00:00 on Thursday" or "24:00 on Thursday". Tony. -- f.anthony.n.finch <[email protected]> http://dotat.at/ HUMBER THAMES DOVER WIGHT PORTLAND: NORTH BACKING WEST OR NORTHWEST, 5 TO 7, DECREASING 4 OR 5, OCCASIONALLY 6 LATER IN HUMBER AND THAMES. MODERATE OR ROUGH. RAIN THEN FAIR. GOOD. --------------------------------------------------- https://lists.uni-koeln.de/mailman/listinfo/sundial
