I'm sorry, but this just not true, and is very misleading. Longitude is, at best, only a /very/ broad indicator of the time zone. If your message was true, then you (in Australia) would not have the Broken Hill situation, and SA & NT would be on +9 (and not +8:30). The actual pattern of time zones is fundamentally based on countries and provinces. In fact, in real-life time zone terms, I think that I would go so far as to say that the 15 degree boundaries serve no useful purpose whatsoever. Best wishes Alan Pritchard The GLOBAL GAZETTEER: the world on file http://www.allm-geodata.com Tel: +44 (0) 1202 417 477
-----Original Message----- From: Muhammad Safeer [SMTP:msafeer@khi.compol.com] Sent: Thursday, June 01, 2000 7:47 AM To: tz@elsie.nci.nih.gov Subject: Longitute/Latitute to TIME zone
Is there any formula to convert Longitute/Heading to time zone.
Regards.
Muhammad Safeer.
Muhammad,
I'm not sure what "heading" has to do with it. Is that the direction in which travel is proceeding? If so, it doesn't affect your "time zone". Only longitude affects that. You can calculate your actual mean-solar-time offset from Greenwich in hours simply by dividing your longtude in degrees by 15. For longitudes east the answer is in hours ahead of Greenwich and for longitudes west the answer is in hours behind Greenwich. If you want to calculate the nearest whole-hour time zone offset, you can simply round the answer from the previous calculation to the nearest hour. For example, I live and work at longitude 151 degrees and about 15 minutes east. That means the time by the sun here is 10 hours and about 5 minutes ahead of Greenwich. The nearest whole-hour time zone offset is thus 10 hours ahead of Greenwich.
--Alex
_______________ Alex LIVINGSTON Macintosh and Lotus Notes Support / Information Technology (IT) Australian Graduate School of Management (AGSM) UNSW SYDNEY NSW 2052 / Australia
Facsimile: +61 2 9931-9349 / Telephone: +61 2 9931-9264 Time : UTC+11---[last Mar. Sun.---UTC+10---[last Aug. Sun.---UTC+11---
At midday today, Friday, June 2, time since epoch (1-1-1 at 00:00:00) is 730272.5 days = 1999.41819476 average Gregorian years time until 3rd millennium, 21st century, 201st decade, 2001st year is 212.5 days = .58180524 average Gregorian years