[OSM-dev] Request for PHP programmers for TWISST project

David James david at djames.org.uk
Sat Oct 2 11:12:05 BST 2010

  On 01/10/2010 23:05, andrzej zaborowski wrote:
> On 1 October 2010 22:32, David James<david at djames.org.uk>  wrote:
>>   On 01/10/2010 17:14, andrzej zaborowski wrote:
>>> On 1 October 2010 18:12, andrzej zaborowski<balrogg at gmail.com>    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
david at djames.org.uk

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