"When do the seasons start?
There are four astronomical seasons on Earth, defined by the movement of the sun in the sky. For the northern hemisphere:
Spring starts at the moment when the sun is directly over the equator, going from south to north: the "vernal equinox"'.
Summer starts at the moment when the sun is farthest north: the "summer solstice".
Fall starts at the moment when the sun is directly over the equator, going from north to south: the "autumnal equinox".
Winter starts at the moment when the sun is farthest south: the "winter solstice"."
nrc.canada.ca/en/certifications-evaluations-standards/canadas-official-time/3-when-do-seasons-start#:~:text=When%20do%20the,the%20%22winter%20solstice%22.
