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In the southern hemisphere, it was June 21st; in the northern hemisphere it is December 21.
For the Northern Hemisphere that would be on or about December 21st
If you mean the longest: When you have the longest day, you'll also have the shortest night, and vice versa. In the northern hemisphere, the longest day is around June 21, and the shortest day is around December 21. In the southern hemisphere, it is the other way round.
The longest season on the northern hemisphere is summer.
It should be remembered that the seasons are diametrically opposed in the hemispheres. When it is summer in the northern hemisphere it is winter in the southern one. Seasons officially start and end on the solstices and equinoxes. The solstices are the days on which daylight or night time are the longest. When the day is longest in the northern hemisphere night is longest in the southern. The equinoxes are when day time and night time are equal which varies depending on your latitude. (Except at the equator)
The longest day of the year, also known as the summer solstice, occurs around June 21st in the Northern Hemisphere. It is when the North Pole is tilted closest to the sun, resulting in the longest period of daylight for that hemisphere.
21 June
The middle of summer, which is, in the Northern Hemisphere, June 21. (Most of the world's tundra is in the Northern Hemisphere.)
In the northern hemisphere, June 21. In the southern hemisphere, December 21,
The inclination of the axis affects seasons (and the amount of light and darkness). In the Northern Hemisphere, the longest day and shortest night are in June. After Summer Solstice, the daylight gradually gets shorter, to the shortest day and longest night in December. In the Southern Hemisphere, Winter Solstice (and shortest day and longest night) are in June, while the Summer Solstice is in December.
summer solstice
Antarctica