Today is June 21, also known as the first day of summer or the summer solstice. Why is this the first day of summer? This means that the north-south axis of the Earth tilts today, so that the northern part of the world is closer to the sun than at any other time of the year. So, if you're in the Northern Hemisphere (Europe, North America), this is the longest day of the year--in the sense that you'll have more sunlight today than at any other time.
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