World Time and Time Zones
These links have been carefully selected and were considered relevant and suitable for school use at the time of checking. Clicking on them will take you to other websites over which we have no control. If you have any doubts or concerns please check what is at the other end before using them in lessons. If you find any broken, re-directed or dead links please let us know.
The U.S naval Observatory provides this page which explains when daylight saving time begins and ends. it also provides a history of daylight saving time.
A real time view of the Earth showing areas of day and night around the planet. You can specify a centre point for the image by entering latitude and longitude co-ordinates, and even chose the point from which you view the planet. You might decide to see the view as if you were on the Sun or Moon looking at earth, stick with a normal map, or pop around to the dark side of the planet to see what that looks like. In fact, you can even decide on what you see; topography,clouds, infra red or false colour weather images!
long are days and nights ?
Lengths of days and nights throughout the year vary. Have you ever wondered how much more daylight you get on the longest day than on the shortest. This site gives a good account of the differences between the longest day and the longest night, the shortest day and the shortest night. The reasons for changes in the length of daylight are also explained.
What is a leap second? Well, it turns out to be rather important. The earth is slowing down by a tiny amount all the time, and this causes clocks to get out of time with the rotation of the earth. Occasionally we have to alter time by a leap second to keep the clocks and the earth working together.
What is a leap year? Most of us think we know the answer, but there are a few rules that people tend to forget. For example, why were 1700, 1800 and 1900 not leap years, but 1600 and 2000 are ? An informative site that helps to clarify some of the confusion around this four year event.
The British Observatory where time 'starts'. The RGO has been closed down, but according to their web page, new links will be set up to maintain the web presence of it's various departments and projects. I presume this site will be where the links appear at some future date.
What time is it now? From this site you can listen to a live broadcast of the speaking clock, look at animated gif images of clocks in different time zones, compute apparent sidereal time and even check the time on your computer against a master clock. You need a computer that runs Java to see some of these features.
A world map showing time zones
Zones in Australia
Short list of time zone information covering the zones that cross Australia. No images, just a short list.
Zones in North America
Quite comprehensive details of the different time zones across North America, covering differences from GMT ( Greenwich Mean Time ) and daylight saving times.
An explanation of Universal Time that is well written and informative. If you think that Universal Time and Greenwich Mean Time are the same thing, you might be right in some respects, but wrong in others. it all depends on how accurate you want to be. If you are interested in time, or using equipment that uses UT, you should read this webpage.
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