Sorry to be brain dead here, but I'm a bit lost: On Fri, Apr 10, 2015 at 4:32 PM, Alexander Belopolsky < alexander.belopol...@gmail.com> wrote:
> For any given geographical location, loc, and a moment in time t expressed > as UTC time, one can tell what time was shown on a "local clock-tower." > This defines a function wall(loc, t). This function is a piece-wise > linear function which may have regular or irregular discontinuities. > got it. > Because of these discontinuities, an equation wall(loc, t) = lt may have > 0, 1 > or 2 solutions. > This is where I'm confused -- I can see how going from "wall" time ("local" time, etc) to UTC has 0, 1, or 2 solutions: One solution most of the time Zero solutions when we "spring forward" -- i.e. there is no 2:30 am on March 8, 2015 in the US timezones that use DST Two solutions when we "fall back", i.e. there are two 2:30 am Nov 1, 2015 in the US timezones that use DST But I can't see where there are multiple solutions the other way around -- doesn't a given UTC time map to one and only one "wall time" in a given timezone? Am I wrong, or is this a semantic question as to what "wall" time means? Thanks for any clarification, -Chris -- Christopher Barker, Ph.D. Oceanographer Emergency Response Division NOAA/NOS/OR&R (206) 526-6959 voice 7600 Sand Point Way NE (206) 526-6329 fax Seattle, WA 98115 (206) 526-6317 main reception chris.bar...@noaa.gov
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