2025年1月2日 · Summer begins with the solstice on Friday, June 20, 2025, marking the astronomical first day of summer in the Northern Hemisphere. What exactly IS the summer solstice? Is it really the longest day of the year?

The summer solstice is the day with the longest period of daylight and shortest night of the year in that hemisphere, when the sun is at its highest position in the sky. At either pole there is continuous daylight at the time of its summer solstice.

2025年1月2日 · When do the four seasons start in 2025—for spring, summer, fall, and winter? Here are the equinox and solstice dates—plus, answers to common questions about the seasons of the year in North America.

When is the first day of summer? Date and time of the southern and northern hemisphere summer solstice 2024/2025, which marks the start of summer season.

When Is The First Day Of Summer 2025? The first day of summer arrives with the solstice this year on Friday, June 20, 2025, 10:42 p.m. EDT. For those of us in the Northern Hemisphere, the Earth tilts mostly toward the Sun during this time.

2024年4月16日 · This year, the first day of summer, also known as the summer solstice, is Thursday, June 20. The true solstice will arrive in the Northern Hemisphere at exactly 4:51 p.m. EST.

2022年9月26日 · The summer solstice marks the official start of astronomical summer and the longest day of the year. It occurs when one of Earth's poles is tilted toward the sun at its most extreme angle, and...

The first day of spring is at the vernal equinox, when day and night are equal. Find out the exact time and date.

2024年6月18日 · Is the summer solstice the first day of summer? Astronomers consider this the beginning of the Summer in the Northern Hemisphere, NASA said.

While Summer starts and ends at the same moment in time all over the Northern Hemisphere, the date of the First Day of Summer differs from location to location depending on a location's time zone. For more details see the explanations below.