In the third week of March each year, the Vernal Equinox occurs, when the sun is over the equator at high noon and for a brief time is shining "equally" in both the Northern and Southern hemispheres.

North Pole
The sun will travel northward, relatively, until the third week in June, when the Northern Hemisphere has its longest day, i.e., period of daylight. Then the sun heads southward again and crosses the equator on the day of the Autumnal Equinox in September.