earths rotation
Published on Nov 22, 2015
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PRESENTATION OUTLINE
The earth rotates about an imaginary line that passes through the North and South Poles of the planet
Photo by VinothChandar
This line is called the axis of rotation. Earth rotates about this axis once each day (approximately 24 hours). Although you most likely already knew that fact, there is a slight complication most people are not aware of.
Photo by Pink Sherbet Photography
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Photo by NASA Goddard Photo and Video
More specifically, our rotation period (the time elapsed for one rotation) with respect to the stars is called a sidereal day. A sidereal day is 24 sidereal hours, or 23 hours and 56 minutes on a normal clock. Our clock time is based on the earth's rotation with respect to the sun from solar noon to solar noon. This is a solar day, and it is divided into 24 hours. Because Earth travels about 1 / 365 of the way around the sun during one day, there is a small difference between solar time and sidereal time.
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SUMMER:-is the warmest of the four temperate seasons, falling between spring and autumn. At the summer solstice, the days are longest and the nights are shortest, with day-length decreasing as the season progresses after the solstice.
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WINTER:-is the coldest season of the year in temperate climates, between autumn and spring. It is caused by the axis of the Earth in the respective hemisphere being oriented away from the Sun. Different cultures define different dates as the start of winter, and some use a definition based on weather, but when it is winter in the Northern Hemisphere it is summer in the Southern Hemisphere, and vice versa.
Photo by Bradley Wells
Autumn, interchangeably known as fall in the US and Canada,[1] is one of the four temperate seasons. Autumn marks the transition from summer into winter, in September (Northern Hemisphere) or March when the arrival of night becomes noticeably earlier and the temperature cools considerably.
Photo by blmiers2
Spring is one of the four conventional temperate seasons, following winter and preceding summer. There are various technical definitions of spring, but local usage of the term varies according to local climate, cultures and customs. When it is spring in the Northern Hemisphere, it will be autumn in the Southern Hemisphere.
Photo by m@®©ãǿ►ðȅtǭǹȁðǿr◄©
We have seasons because the earth is tilted (wonky) as it makes its yearly journey around the sun. The Earth's axis is tilted at an angle of 23.5 degrees. This means that the Earth is always "pointing" to one side as it goes around the Sun.
Photo by tim caynes
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