Matematika Ria
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Hak cipta © 2009

Sun Clock

(Note: this clock uses the time on your computer as its reference)

About the Sun Clock

See at a glance who is in Day or Night, and follow the Sunset and Sunrise around the World.

Your local time is shown at the lower left corner, and representative times are shown along the bottom, with "UTC" time highlighted centrally.

About the Map

The Planet Earth's shape is similar to a Sphere, but maps are Flat.

Curved onto Flat doesn't quite work ... try wrapping a piece of paper around a ball and you will see that there are problems here!

So, whenever you draw a map of the world you have to ask "how will I fit the shapes on the curved surface on to the flat surface?" This is called Projection, and every method of projection has its problems.

In this case I used a special type of Cylindrical Projection called Plate Carrée, or Equirectangular Projection, because it works a bit like an x-y graph (which made the mathematics a lot easier)

  (It makes the land near the poles squashed-and-stretched, but it works well for most places!)