un map

111, 333, 666, and many other curious digits. What are Demlo numbers?

The Earth map used in the UN flag: 33 sectors

A grid, probabl
y representing parallels and meridians, divides the Earth in 33 sectors. Another special number is 11, 33 being a multiple of it. You probably wonder what  it means and what relation have these numbers with the Earth.

33 appears immediately as a particular number, being a palindrome. Moreover 3×3=9;  33×3=99… another palindromic digit I like is the number 12321. If you sum all digits, you’ll obtain 9 again. Read more

How to model your Earth with Google Sketchup

Sketchup is a 3D CAD software by Google. Many people do not consider it as a professional CAD but it has some good characteristics:

–It is free: you can easily download it from sketchup.com;

–It is simple to use and it enjoys of an excellent support on Internet with many tutorial videos;

–It doesn’t require a workstation but you can reach satisfactory results even without having dedicated graphic board installed on your PC.

When focusing the Earth, the sun, the dome… we’ll have to take into consideration the Universe geometry and its dimensions. By the help of a 3d model, set in the correct scale, and possibly an animation, we shall be able to have a better idea of this complex subject.

It would be great to have communication and interchange on the base of 3d components and keep in touch with many people able to use the CAD: sketchup allows an easy communication.

So let’s start with our model.

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