Probably inaccurate Day/Night cycle of a planet orbiting a star orbiting another star my brain was interested in what this would look like, but too lazy to figure it out, so I simulated it instead. Sliders: rotation: planet rotation orbit: Planet orbit around star sunorbit: star orbit around other star Gravity is weird and none of this works like shown, F=(G*m1*m2)/d^2 is inaccurate and this doesn't even follow that. Remember, the brightest part is day*2, and the darkest part is normal nighttime.