About this Blog

This is my first blog. Ever.

It is simply going to be about my hobby; playing with computer programming. I do not know much about blogging, but I will use this one to learn a bit more about it.

Programming has always been a bit of a passion for me, as from those early days when I first tapped in a sample BASIC program on my old Sinclair Spectrum back in 1986. I have been through many platforms, languages and OS's since, but always carried the hobby with me. I am not particularly good at it; perfection requires a large time investment and continuous practice. I do not have the luxury of the amount of time required to keep the fire burning constantly, so the hobby has inevitably gone through periods of extreme withering. I have, however, finally settled for C++, as the title of this blog implies, and play around with it for some entertainment when ever I can.

This here will serve me as a written record of what I am up to, and hopefully be a reinforcement to my memory every now and then. That is all there is to it.

So, if you read this blog, please don't expect anything snazzy, but be you welcome just the same!

Tuesday, 20 September 2011

More on Barycenters

Picking up a bit where I left off. According to someone with a Phd on a forum that knows a great deal about astrophysics, there was absolutely nothing wrong with my rendition of a barycenter orbit. The shifting of the barycenter if no "counter velocity" is established for the more massive body will occur because momentum must be conserved. Makes sense.

Anyway, here is a representation of the same barycenter orbit, the white one leaving the visual representation (the frame of reference) as it is, the orange one "correcting" the positions so that it appears that the more massive body is "stationary". It is a visual trick, they are really the same orbit.

And here's the "correcting" code.

barycenter_length = radius * (charon_mass / (charon_mass + pluto_mass));
bary_x = sin(angle_to_charon) * barycenter_length;
bary_y = cos(angle_to_charon) * barycenter_length;

Then, this code keeps the more massive body centered...

pluto_x + bary_x
pluto_y + bary_y

And so on for Charon. That is, by the way, the formula for establishing a barycenter;

Bc = Radius * (lesser_mass / (lesser_mass + greater_mass))

I am sort of up to my eyes in work this month, so progress will be slow.

'Till the next!

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