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RE: What exactly is an orbit? An Introduction
Bravo, good article. Glad to see you back posting stem articles. Just one clarification in your diagram it references perihelion and argument of perihelion. Perihelion is closest approach to sun, perigee typically references other bodies like the earth. Periastron is typically used for stars.
Good catch - I used to use peri/apoapsis for generality but slipped into the habit of calling everything -gee from my orbits classes recently.