Eh, your figure only has the Earth tilted at 45°... But we actually have an example of close to 90° tilt in our Solar system. Uranus is tilted 97.92° with respect to the Ecliptic and has a 15h34m12s rotation period and an 84 year revolution around the Sun. But to back to your simpler example: * On the Equator, days would always be 24 hours long, but twice a year there would be 24 hours of Sun-set/rise - well the Sun would sit on the horizon. * The poles would half half a year of "night" and half a year of "day". * In between, the days would be 24 hours but the day or night part would progressively get shorter until a certain time of year (depending only on latitude) the Sun wouldn't set or rise until next spring/fall - just as is actually the case above the Polar Circles. Elementary, my dear Watson.. - Regner philip madsen wrote:
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