Review the key concepts, formulae, and examples before starting your quiz.
🔑Concepts
The Earth spins on an imaginary line called the Axis, which passes through the North and South Poles. This axis is tilted at an angle of .
The spinning movement of the Earth on its axis from West to East is called Rotation. It takes approximately hours to complete one rotation.
Rotation causes the formation of day and night. The half of the Earth facing the Sun experiences day, while the half facing away experiences night.
The movement of the Earth around the Sun in a fixed, elliptical path called an Orbit is known as Revolution.
The Earth takes days to complete one full revolution around the Sun.
Revolution, combined with the tilt of the Earth's axis, causes the change in Seasons (Summer, Winter, Autumn, and Spring).
A Leap Year occurs every years because the day from each year is added up () to create an extra day, making the year days long.
📐Formulae
💡Examples
Problem 1:
If the Earth takes hours for rotation, how many hours will it take to complete rotations?
Solution:
hours
Explanation:
Since one rotation equals hours, we multiply the number of rotations by the hours in a single rotation: .
Problem 2:
Calculate the total number of days in consecutive years, considering one of them is a leap year.
Solution:
days
Explanation:
Standard years have days. Every fourth year is a leap year with days. Therefore, days.
Problem 3:
Why does the Sun appear to move from East to West across the sky?
Solution:
Due to the Earth's West-to-East rotation.
Explanation:
The Earth rotates on its axis from West to East. This creates the relative motion that makes the Sun appear to rise in the East and set in the West.