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Thank you. I searched forum for orbit intersection and didnt notice topic you pointed out. I used half angle trig identity you suggested immediately, but it took me a week to detect missing brackets in excel in denominator of quadratic equation solution formula, /2*a instead /(2*a) :-). It...

I would like to calculate intersection of two orbits in same plane. I had my last math class 15 years ago and i do not use it for living, so if i assumed something wrong and/made some silly mistake(s) please point it out but be gentle :-) If i have two coplanar orbits with known semimajor axis...