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Sailing into the Sunset - ©iStockphoto.com

United States
Holidays

Administrative Professionals Day

April Fools' Day

Arbor Day

Ash Wednesday

Autumn

National Boss Day

Christmas Day

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Cinco de Mayo

Columbus Day

秒速赛车官方网站 Daylight Saving Time

Earth Day

Easter

秒速赛车官方网站 Election Day

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Kwanzaa

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Mardi Gras

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Spring

St. Patrick's Day

Summer

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Washington's Birthday

Winter

 

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 20th or 21st). This day is known as the Summer Solstice.

The declination of the Sun on the Summer Solstice is known as the tropic of cancer (23° 27').  In the southern hemisphere, winter秒速赛车官方网站 and summer solstices are exchanged so that the Summer Solstice is the day on which the Sun is farthest south.

A common misconception is that the earth is further from the sun in 秒速赛车官方网站 winter than in summer. Actually, the Earth is closest to the sun in December which is winter in the Northern hemisphere.

As the Earth travels around the Sun in its orbit, the north-south position of the Sun changes over the course of the year because of the changing orientation of the Earth's tilted rotation axes. The dates of maximum tilt of the Earth's equator correspond to the Summer Solstice and Winter Solstice, and the dates of zero tilt to the Vernal Equinox and Autumnal Equinox.

 

 

The reason for these changes has to do with the Earth's yearly trip around the sun. For part of the year the Earth's North Pole points away from the sun and part of the time toward it. This is what causes our seasons. When the North Pole points toward the sun, the sun's rays hit the northern half of the world more directly. That means it is warmer and we have summer.

The day of the summer solstice is the longest day of the year。 The length of time elapsed between sunrise and sunset on this day is a maximum for the year。 In the United States, there are about 14½ hours of daylight on this day。

 

Hurricane Season


June is the traditional start of Hurricane Season in the United States. Hurricane Season in the Atlantic runs from June 1st to November 30th. Most hurricanes occur from mid-August to late October.

 

Hurricane Map

Hurricane map courtesy U. S. Geological Survey

 

 

 

Links

 

- Ready.gov is a national public service advertising (PSA) campaign designed to educate and empower Americans to prepare for and respond to emergencies including natural and man-made disasters. The goal of the campaign is to get the public involved and ultimately to increase the level of basic preparedness across the nation.

 

- Through the Naval Oceanography Portal, the United States Naval Observatory provides astronomical information on the Earth's orbit around the Sun and how it relates to the changing seasons.

 

(The United States Naval Observatory)

 

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