Short & Long Questions: Rotation and Revolution | Footprints Class 6: Book Solutions, Notes & Worksheets PDF Download

Short Answer Questions

Q1: What is rotation?
Ans: Rotation is when the Earth spins around like a top, from west to east, on an imaginary line called an axis.

Q2: How long does it take for the Earth to complete one full rotation?
Ans: It takes about 24 hours for the Earth to complete one full rotation.

Q3: What is the circle of illumination?
Ans: The circle of illumination is the line that separates the part of the Earth in daylight from the part in darkness.

Q4: What is revolution?
Ans: Revolution is when the Earth moves around the Sun in an oval-shaped path called an orbit.

Q5: Why do we have different seasons?
Ans: We have different seasons because of the way the Earth moves around the Sun and because of its tilt.

Long Answer Questions

Q1: Explain the concept of the circle of illumination and its significance.
Ans: The circle of illumination is an imaginary line that separates the part of the Earth in daylight from the part in darkness. It's like a boundary between day and night. When the Sun is directly over a specific area, it's daytime there, and the rest of the Earth is in darkness. This concept helps us understand why different parts of the world experience day and night at different times. As the Earth rotates, the circle of illumination moves, causing day to shift to night and vice versa.

Q2: How does the Earth's revolution around the Sun contribute to the changing of seasons?
Ans: The Earth's revolution around the Sun is a key factor in creating the different seasons. As the Earth moves in its orbit, sometimes one hemisphere is tilted towards the Sun and receives more direct sunlight, while the other hemisphere is tilted away and gets less direct sunlight. This tilt, along with the Earth's movement around the Sun, leads to variations in temperature and weather conditions, resulting in the distinct seasons of spring, summer, autumn, and winter.

Q3: Explain why we have leap years and how they help align our calendar with the astronomical year.
Ans: Leap years are added to our calendar to make up for the extra 0.25 days it takes for the Earth to complete one orbit around the Sun. Since the calendar year is based on approximately 365.25 days, every four years an extra day is added to keep our calendar in sync with the actual time it takes for the Earth to orbit the Sun. This extra day is inserted at the end of February, making it 29 days instead of the usual 28.