Revolution Of The Earth Causes The Seasons

key notes :

Definition of Revolution:

• The Earth revolves around the Sun in a fixed path called an orbit.
• One complete revolution takes 365 1/4 days, which equals one year.

Tilt of the Earth’s Axis:

• The Earth’s axis is tilted at an angle of 23.5 degrees.
• This tilt is the main reason why different parts of the Earth experience different seasons.

Position of the Earth and Seasons:

• As the Earth moves around the Sun, different areas receive varying amounts of sunlight, leading to the seasons.
• Summer: When a hemisphere is tilted toward the Sun, it experiences summer.
• Winter: When a hemisphere is tilted away from the Sun, it experiences winter.
• Spring and Autumn: These are transition periods when neither hemisphere is tilted significantly toward or away from the Sun.

Effect of Sunlight:

• During summer, the Sun appears higher in the sky, and days are longer because the Sun’s rays are more direct.
• During winter, the Sun is lower in the sky, and days are shorter because the rays are less direct.

Solstices and Equinoxes:

• Summer Solstice: The longest day of the year (around June 21).
• Winter Solstice: The shortest day of the year (around December 21).
• Equinoxes: Equal day and night (around March 21 and September 23).

Difference Between Rotation and Revolution:

• Rotation: The Earth spins on its axis, causing day and night.
• Revolution: The Earth moves around the Sun, causing seasons.

Importance of Seasons:

• Seasons affect weather, plant growth, and human activities.
• They bring variety to the environment and play a key role in the life cycles of living organisms.

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