We produce and sell software for astronomy and calendrics, and host several astronomy and calendar services on our site.
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Time Zone Master is a new Windows Clocks program from Relative Data.
A Windows Clock Program Done Right
There are literally hundreds of clock display programs available for Windows. But virtually all of them use Window's own timezone database of UT offsets and daylight saving/summertime rules. But what happens when countries or regions then change to different clock rules? Windows timezone database, and windows clock programs that depend on it, are then wrong and can remain wrong for as long as six months before Microsoft updates their database! Certainly, most Windows clock programs are not something to depend on!
By Using the Olson Zoneinfo tz Database
Instead, Time Zone Master internally uses the comprehensive Olson Zoneinfo tz database, maintained using input from hundreds of corporate contributors worldwide, and used on Linux servers. Whenever any regional clock law change become known and confirmed, the database is quickly updated! Time Zone Master can then automatically download and install these updates within hours, not months! With Time Zone Master, your displayed clocks will always be as accurate as possible; now, and into the future!
It's also a Unique Astronomy and Timezone Research Tool
Time Zone Master adds over 200 countries, and over 45,000 towns and cities to its database, making it easy to select your clocks!
But far more than just a clock display program, Time Zone Master then adds all known historical timezone rules for 300 different world timezone regions going back to at least 1970, and for primary cities in these regions back to before the mid 1800s, making accurate historical time-of-day research possible! In comparison, windows built-in timezone database has NO historical timezone rules data.
Finally, Time Zone Master is also a highly accurate astronomical clock, showing Sunrise/Sunset, Moonrise/Moonset, the times of moon phases, and the start of the seasons, the local Mean Time, Equation of time, Solar Sundial Time, Sidereal Time, and Terrestrial Time for each Read more »
I read a Wikipedia article on King Mongkut of Siam...
"Mongkut was always interested in Astronomy. In 1868, he invited Sir Harry Ord, the British Governor of Straits Settlements from Singapore, as well as a party of French astronomers and scientists, to watch the total solar eclipse of 18 August, which King Mongkut himself had calculated two years earlier, at (in his own words) "East Greenwich longitude 99 degrees 42' and latitude North 11 degrees 39'." Read more »
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