In the United States and the rest of the northern hemisphere, the first day of the summer season is the day of the year when the Sun is farthest north (on June 20

In the rest of the US and the Northern Hemisphere, the first day of the summer is the northernmost of the sun (June 20 or 21). This day is called the summer solstice.

The declination of the sun during summer solstice is called Tropic of Cancer (23 ° 27 '). In the Southern Hemisphere, winter and summer are exchanged so that the summer solstice becomes the southernmost tip of the sun.

A common misunderstanding is that the earth is far from the sun in the winter than in the summer. In fact, the earth is closest to the sun in December, this is the winter of the northern hemisphere.

When the earth goes round the sun, the north-south position of the sun changes throughout the year as the direction of the tilt axis of the earth changes. The date of the maximum inclination of the Earth's equator corresponds to summer solstice and winter solstice, and spring equinox and autumn equinox date.

The reason for these changes is related to the Earth's annual sun travel. During the year, the Earth's Arctic is pointing away from the sun. This is the reason for this season. When the Arctic is pointing to the sun, the ray of sun more directly hits the northern half of the world. It's warm, we have summer

Summer solstice is the longest day of the year. The length of time from sunrise to sunset for this day is the largest in a year. In the United States, the sunlight is about 14 hours and half.

June is the traditional beginning of the American hurricane season. The Atlantic hurricane season is from June 1 to November 30. Most hurricanes occur from mid-August to late October

Ready - Ready.gov is a National Public Service Advertising (PSA) campaign aimed at educating and giving power to Americans to prepare for emergencies including natural disasters and human-induced disasters. The purpose of this event is to involve the general public and ultimately improve the basic preparation level nationwide.

Four seasons and the earth 's orbit - through the naval oceanography portal, the US Navy Observatory provides astronomical information on the relationship between the orbit of the earth around the sun and its seasonal change.

The seasonal astronomical definition is related to a specific point of the earth around the sun. Summer and winter solstice, the longest and shortest day of year, the axis of the earth occurs at the nearest or furthest point from the sun. According to the National Oceanic and Atmospheric Administration, the summer solstice of the Northern Hemisphere occurred around the same June 21 as the Winter Solstice of the Southern Hemisphere. The summer solstice in the south is December 21 and the winter solstice in the north. In both hemispheres the summer solstice shows the first day of the astronomical summer and the winter solstice is considered the first day of the astronomical winter.

Summer, spring to autumn, the warmest season in a year. In the Northern Hemisphere, it is usually defined as the summer solstice on June 21st or 22nd (the longest day of the year), the fall dividing point on September 22nd or 23rd (the same day), the Southern Hemisphere on 22nd December. From day 23 or 23 to March 20 or 21. Comparison of the temperature between summer and other seasons is done only at mid-high latitudes, and the temperature of the equatorial region usually does not change much from month to month. For the physical reasons of the season, please see the season