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  #1  
Old Friday, May 18, 2012
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Default Types of Earth's Movement

Types of Earth's Movement


There are two types of movement of earth: Earth's Rotation and Earth's Revolution.

1. Earth's rotation

Earth's rotation is the rotation of the planet Earth around its own axis. The Earth rotates towards the East. If we look down at the Earth's North Pole from space we can notice that the direction of rotation is counter-clockwise. One rotation completes in 23 hours, 56 minutes and 4 seconds.



2. Earth's Revolution
The other motion of Earth is around the Sun. It is called as Revolution of the Earth. Earth completes one complete revolution around the Sun in 365 days, 5 hours, 45 minutes and 46 seconds. The path which Earth takes around the Sun is called Earth’s Orbit. The Earth's orbit around the Sun is not circular, but oval or elliptical.



Effects of Earth’s Movements:

1. Days and Nights

The Earth’s rotation is responsible for the daily cycles of day and night. The portion of Earth, which is within the circle of illumination caused by the rays of sun, has its day. The other side of earth, which is away from Sun, remains dark and therefore has its night.



2. Change of Seasons

The change of Seasons occurs by the yearly revolution of the Earth around the Sun and the tilt of the Earth's axis relative to the plane of revolution. During May, June and July, the northern hemisphere is exposed to more direct sunlight because the hemisphere faces the sun. As the sun rays fall vertically and for a longer period in the Northern Hemisphere, there will be summer. But in the Southern Hemisphere it will be winter.
In Southern Hemisphere the conditions become reversed in November, December and January. There will be summer in Southern Hemisphere and winter in Northern Hemisphere.


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  #2  
Old Friday, May 18, 2012
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Originally Posted by Arain007 View Post
Types of Earth's Movement


There are two types of movement of earth: Earth's Rotation and Earth's Revolution.

1. Earth's rotation

Earth's rotation is the rotation of the planet Earth around its own axis. The Earth rotates towards the East. If we look down at the Earth's North Pole from space we can notice that the direction of rotation is counter-clockwise. One rotation completes in 23 hours, 56 minutes and 4 seconds.



2. Earth's Revolution
The other motion of Earth is around the Sun. It is called as Revolution of the Earth. Earth completes one complete revolution around the Sun in 365 days, 5 hours, 45 minutes and 46 seconds. The path which Earth takes around the Sun is called Earth’s Orbit. The Earth's orbit around the Sun is not circular, but oval or elliptical.



Effects of Earth’s Movements:

1. Days and Nights

The Earth’s rotation is responsible for the daily cycles of day and night. The portion of Earth, which is within the circle of illumination caused by the rays of sun, has its day. The other side of earth, which is away from Sun, remains dark and therefore has its night.



2. Change of Seasons

The change of Seasons occurs by the yearly revolution of the Earth around the Sun and the tilt of the Earth's axis relative to the plane of revolution. During May, June and July, the northern hemisphere is exposed to more direct sunlight because the hemisphere faces the sun. As the sun rays fall vertically and for a longer period in the Northern Hemisphere, there will be summer. But in the Southern Hemisphere it will be winter.
In Southern Hemisphere the conditions become reversed in November, December and January. There will be summer in Southern Hemisphere and winter in Northern Hemisphere.

i think in December, January and February, there is winter in southern hemisphere as because of earth's revolution the northern hemisphere is exposed to direct sunlight, not southern....correct me if am wrong....
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Old Friday, May 18, 2012
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i think in December, January and February, there is winter in southern hemisphere as because of earth's revolution the northern hemisphere is exposed to direct sunlight, not southern....correct me if am wrong....
In December Southern Hemisphere is exposed to direct sunlight. So there will be summer. In May, June and July, the northern hemisphere is exposed to direct sunlight. So there will be Summer in Northern Hemisphere at that time. Pakistan is situated in Northern Hemisphere. We experience summer in May, June and July. Countries like Australia situated in Southern Hemisphere and there is summer in December.
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sir are sure about

365 days, 5 hours, 45 minutes and 46 seconds remains constant for every year?.for every year it changes a bit e.g

1985–1986 365d 5h 48m 58s
1986–1987 365d 5h 49m 15s
1987–1988 365d 5h 46m 38s
1988–1989 365d 5h 49m 42s
1989–1990 365d 5h 51m 06s


in wikipedia it's 365 solar days, 5 hours, 48 minutes, 45 sec
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Old Sunday, May 20, 2012
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Originally Posted by azzee View Post
sir are sure about

365 days, 5 hours, 45 minutes and 46 seconds remains constant for every year?.for every year it changes a bit e.g

1985–1986 365d 5h 48m 58s
1986–1987 365d 5h 49m 15s
1987–1988 365d 5h 46m 38s
1988–1989 365d 5h 49m 42s
1989–1990 365d 5h 51m 06s


in wikipedia it's 365 solar days, 5 hours, 48 minutes, 45 sec
You are right that this time duration is not constant for every year. Instead of writing complete duration, we can use "Approximately 365 days".
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