Earth and the sky – solar altitude by latitude and season

PhysicsGravitation & AstronomyAges 15–16

Earth's axis is tilted 23.5°, so the Sun's noon altitude and the length of day change with latitude and with the day of the year. Choose an observing location and a date to see the Sun's path across the sky, and see why regions near the tropics have two days a year when the Sun passes through the zenith while polar regions have midnight sun or polar night.