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The first day of summer changes annually, arriving on June 20, 21 or 22. That's because the earth's astronomical year is actually 365.25 days long, writes Space.com.
The first day of summer changes annually, arriving on June 20, 21 or 22. That's because the earth's astronomical year is actually 365.25 days long, writes Space.com.
The first day of summer changes annually, arriving on June 20, 21 or 22. That's because the earth's astronomical year is actually 365.25 days long, writes Space.com.
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