“ORBITAL MECHANICS” Tatiana Plakhova
The provenance of the Pickett N600 in spaceflight. The mini ‘log log’ rule offers an extremely powerful tool in a compact package and saw use in both of it’s T(white) and ES(yellow) forms aboard Gemini and Apollo missions.
The World and The Sun
The question of which one goes around which can be considered either way, but one of them has much simpler math.