On the summer solstice, the Sun is directly over the Tropic of Cancer.
After the summer solstice has taken place, the autumnal equinox in September will mark the beginning of autumn.
The winter solstice in December marks the beginning of the winter period in the Northern Hemisphere, and this date is usually known as the shortest day of the year.
On the winter solstice, the Sun is directly over the Tropic of Capricorn.
The March or spring equinox signifies the start of spring.