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First real thread besides my introductory thread.

I'm a Danish student in what is somewhat equivalent to my junior/senior year in the american school system. That was a small attempt at school system conversion.

I'm writing a project about the black hole Sgr. A* in the centre of our galaxy. I'll try to explain my situation the best I can:

__The project__: As mentioned I'm writing a school project. The grade is pretty influential on my average grade, so I'm interested in writing a good project. I'm already past half of my writing time.

Based on coordinates given in a seperate document, I've plotted the ellipse of star S2's movement around Sgr. A* which is assumed to be a black hole at the centre of the Milky Way. I've corrected for the tilt, so that I could calculate the true semi-major axis and I am currently doing a few other procedures in order to get the period, so I may apply Kepler's 3rd law in order to calculate the mass of the black hole.

__My issue__: I'm writing a few paragraphs on the properties of a black hole. I've included a little about the Schwarzchild radius, gravitational lensing, the theory of general relativity, the three externally observable properties which are the mass, angular momentum and the charge of the black hole in accordance with the No-hair hypothesis.

Since I'm writing in BOTH mathematics and physics, I'd like to perhaps include a few formulas and/or calculations that show understanding of what I've only described with words (the above-mentioned). The only mathematical calculation I've done for this section, is calculating the Schwarzchild radius of the Earth, which is very basic. My maths is limited to what I consider basic calculus understanding and my physics knowledge is also limited compared to a few of the guys on this site, that obviously understand physics and astronomy in great depth.

By the way I also plan on writing about the accretion disc, perhaps the jets and the singularity - I still have to fully grasp those parts yet through a bit of reading.

Does anyone have (relatively simple) calculations or formulas, that I could apply to my section about black holes generally, that would demonstrate a higher degree of understanding? Links to sources are also very much appreciated.

Much appreciated!

Alexander