Spring does not contain the longest day ... night are approximately equal in length, marking the beginning of spring in the Northern Hemisphere. This phenomenon occurs around March 20 each year.

Meteorologists, who define the seasons differently, said spring began March 1. And for the folks down under in the Southern Hemisphere, it's the autumnal equinox this Sunday, marking the first day ...

The summer solstice marks the official start ... for the Northern Hemisphere — also known as the June solstice — currently shifts between June 20, 21 and 22. The summer solstice does, however ...

While the summer solstice is not until June 20, many scientists consider the start of summer to be much sooner.

There are four seasons; spring, summer, autumn and winter. The seasons relate to weather patterns in parts of the world such as Europe and North America where the onset ... and fast criteria to ...

But the spring ... between the Northern and Southern Hemisphere. During the equinox, day and night will be about the same length, however, the spring equinox marks the beginning of spring and ...

There are four seasons; spring, summer, autumn and winter. The seasons relate to weather patterns in parts of the world such as Europe and North America where the ... hard and fast criteria to ...

For many, Memorial Day marks the unofficial start of summer, but the season does not technically begin ... marking the moment the Northern Hemisphere enjoys the most daylight of the year.