# How would latitude affect day/night lengths on a planet with no axial tilt?

How would the length of day and night change with changes in latitude on a planet with no axial tilt?

Would the poles of the planet be in constant sunlight?

• If you hold a sphere up to sunlight, I think the answers will become clear. – Carl Witthoft Feb 7 '18 at 14:22

• Bonus points for noting that the sun is neither a point source nor a planar source. Subtract $\epsilon$ points for not mentioning the apparent sunset/rise vs latitude for a very tall person :-) – Carl Witthoft Feb 7 '18 at 14:25