Equality at the Equinox
Every year, the Earth’s axis completes a cycle of tilting towards the Sun, tilting away from the Sun, and finally back towards the Sun again.
Every 6 months an equinox occurs which means that the Earth is neither tilting toward the Sun nor tilting away from the Sun. The daytime is exactly the same length as the nighttime and the temperatures in the Northern Hemisphere are similar to the temperatures in the Southern Hemisphere.