Sun-Synchronous Orbit... huh, that one you can't do in Kerbal Space Program.

Turns out SSO is exploiting the fact that Earth isn't a perfect sphere, and so you can use the non-spherically-symmetric gravity field to induce precession in your orbital plane. If you tune the precession go 360° per year, you get a Sun-Synchronous Orbit.

Decent.

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[0] - https://en.wikipedia.org/wiki/Sun-synchronous_orbit#Technica...