On 01/10/2010 23:05, andrzej zaborowski wrote:
On 1 October 2010 22:32, David James<[email protected]> wrote:
On 01/10/2010 17:14, andrzej zaborowski wrote:
On 1 October 2010 18:12, andrzej zaborowski<[email protected]> wrote:
Checking if a point is inside a polygons is trivial, but is it what
they really want? Wouldn't just the longitude tell you the time
better than the timezone?
E.g. offset_from_gmt = ((lon - 180) / 15) hours
oops, rather (lon / 15) hours
Timezone boundaries do not exactly follow lines of longitude (Google finds a
nice map here: http://www.travel.com.hk/region/timezone.htm).
Yes, that's my point. The longitude is likely a better indicator of
when people are active than the timezone (judging mostly from what
time people tend start the day at the two ends of the European
GMT+1/+2 strip.)
The original email said "I'm a user of TWISST, a free service run by
volunteers that sends tweets notifying the best viewing times for
overhead passes of the International Space Station. "
I'd have thought a user of that service was more likely to want the time
to be given in his/her current civil time (that he can see by looking at
a clock) rather than as a time that in some cases would not match the
time on his local clocks at all.
--
David James
[email protected]
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