How long does it take for the seasons to occur?

Answer 1

Lets start with the Earth at a zero degree tilt both in the Northern Hemisphere and in the Southern Hemisphere. This is called the equinox, because neither hemisphere is tilting towards the sun. Now as the Northern Hemisphere tilts towards the sun at a tilt of 23.5 degrees which actually varies over time, but for this explanation lets just say 23.5 degrees. When the Northern Hemisphere reaches this tilt towards the sun, the Northern Hemisphere has summer, while the Southern Hemisphere has winter, because the Southern Hemisphere is tilted away from the sun at 23.5 degrees. The opposite case is true for when the Northern Hemisphere has winter and the Southern Hemisphere has summer.

Answer 2

That would be the simplest definition of a year.

Answer 3

Each season lasts for 3 months spring : February, March and April

Summer : May, June and July Autumn : August, September and October

then Winter : November, December and January