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Q.

How do you explain the cause of seasons?

Asked by narendra sharma, 04 Dec '12 11:26 pm
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1.

Seasons exist because the Earth's axis of rotation isn't quite perpendicular to its orbital plane (the path the Earth traces around the Sun). Instead, it is about 23 degrees away from being perpendicular.

That means that during part of the Earth's orbit, the northern hemisphere is leaning toward the Sun, so it gets more sunlight, while the southern hemisphere is leaning away, so it gets less sunlight. Six months later, the situation is reversed. In-between these extremes, the Earth's axis isn't exactly toward or away from the Sun, but rather is tangent to its orbit, so both hemispheres get similar amounts of sunlight.

When a hemisphere gets more sunlight due to the tilt, it is summer. When it gets less, it is winter. In-between, it is spring or fall. The cycle is the same in each hemisphere, only 6 months apart.
Answered by jakir hussain, 05 Dec '12 12:24 am

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2.

Due to the rotation of the earth round the sun on its axis
Answered by rajnikant raiyarela, 05 Dec '12 05:08 pm

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3.

The seasons are caused by the tilt of the Earth's rotational axis away or toward the sun as it travels through its year-long path around the sun
Answered by Quest, 05 Dec '12 11:07 am

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4.

The seasons are caused by the tilt of the Earth's rotational axis away or toward the sun as it travels through its year-long path around the sun
Answered by aflatoon, 05 Dec '12 09:54 am

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5.

The seasons are caused by the tilt of the Earth's rotational axis away or toward the sun as it travels through its year-long path around the sun.

The Earth has a tilt of 23.5 degrees relative to the "ecliptic plane" (the imaginary surface formed by it's almost-cicular path around the sun). The tilt toward the sun is maximized during Northern Hemisphere summer in late June (the "summer solstice"). At this time, the amount of sunlight reaching the Northern Hemisphere is at a maximum.

In late December, on the date of the "winter solstice", the Earth's tilt away from the sun is maximized, leading to a minimum of sunlight reaching the Northern Hemisphere. The seasons, of course, are reversed in the Southern Hemisphere.

During the winter, cold air masses build up over North America, Europe, and Asia, due to the low intensity of sunlight. The oceanic air masses are much less affected by the seasons because circulations in the upper ocean replenish warm surface water if it has been ...more
Answered by iqbal seth, 05 Dec '12 07:08 am

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6.

He seasons occur because the earth's axis is tilted as the earth orbits around the sun. The north end of the axis points in the same direction almost directly to the North Star. On June 21 the Northrn Hemisphere is tilted toward the sun. This is when the Northern Hemisphere receives its maximum radiation. Dec. 21 the Southern Hemisphere is tilted toward the sun. The Northern Hemisphere receives its minimum radiation from the sun. This is the start of winter in the Northern Hemisphere and the start of summer in the Southern Hemisphere.
Answered by anil garg, 05 Dec '12 01:11 am

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7.

Love
Answered by harshal kalangutkar, 04 Dec '12 11:26 pm

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