June 20, 21 or 22? … The first day of summer has a very special meaning: it is the day when the duration of the sun’s brightness is the longest of the year. This usually falls on June 21. But it was astronomers who, by studying celestial mechanics, explained what a summer day is. It is the day when the Earth’s illumination by the sun is the longest.
The summer solstice is the day when the sun is at its highest point in the sky. Astronomical summer is determined by the intersection of the movement of the Earth with the path of the Sun. In the Northern Hemisphere, the summer solstice occurs between June 20 and 22.
24 degree tilt
The Earth revolves around the Sun, and its axis of rotation is tilted by about 24 degrees. This trend is consistent throughout the year. So over the course of half the year, the northern hemisphere is more sun-oriented than the southern hemisphere. That’s why when we go back to summer in the northern hemisphere, it’s winter in the southern hemisphere.
As surprising as it may seem, when it’s summer in the northern hemisphere, the Earth is farthest from the sun in its annual course. And six months later, when it’s winter, it approaches.
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