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**George,Y****Member**- Registered: 2006-03-12
- Posts: 1,341

Hello Everyone!

I need to draw a logo representing the earth in the solar system

It looks like this:

1) An perfect circle to represent the earth

2) a 22.5 degree slanted ellipsoid to represent the equater on the earth

3) several longitude lines from north pole to south pole that intersects with equater

Can you model equater and longitude lines by elliptic equations?

Any help is appreciated

*Last edited by George,Y (2019-07-16 19:41:30)*

**X'(y-Xβ)=0**

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