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Comment Re: Just what the Moon always wanted (Score 1) 97

In order to account for binary systems, I like to generalize and say it's all the same although the formula to compute the actual center of mass when inside the larger body differs than when it is outside. This is because when inside the larger body, some part of the larger body modify the gravitational attraction from the smaller body.

But in the end, the important point to be aware of is the center of mass.

http://slashdot.org/comments.p...

As a side note. although there is few references to such cases, it is the same for 3,4,5... body systems. All you have to understand is the center of mass.

Translated to slashdot developer like language: Understand the basic principles and avoid re-inventing the wheel as much as possible.

Comment Re: Just what the Moon always wanted (Score 1) 97

Congratulation!

Here is a link with a nice animated gif that shows it all:
https://en.wikipedia.org/wiki/...

Oh and yes, I already knew the center of mass was inside the Earth and both planets rotate around that center of mass which is pretty close to rotating around each other in popular language.

Comment Re:Ever hear of "sociology"? (Score 1, Interesting) 274

Of course you are right, but I find interesting that something as obvious as this is posted on /. You know, the obvious is often hidden more and more these days.

As for second languages, I master 2 languages fluently. I learned the second one at 18 using total immersion language learning. It is a shame that I never took the time to learn a third, fourth and fifth one or more this way.

I recommend total immersion for those wanting to seriously learn another language, you will experience what the poster is talking about even more deeply ;-)

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