Earth, Moon, and the Sun
CBSE · Class 7 · Science
Quick revision notes for Earth, Moon, and the Sun — CBSE Class 7 Science. Key concepts, formulas, and definitions for last-minute revision.
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Key Topics to Revise
Rotation of the Earth
- The Sun appears to move across the sky from East to West due to Earth's rotation, not because the Sun actually moves
- Earth rotates on its axis (imaginary line passing through North and South poles) once every 24 hours
- When viewed from above the North Pole, Earth rotates anti-clockwise (West to East)
Revolution of the Earth
- Earth revolves around the Sun in a nearly circular orbit while rotating on its axis
- One complete revolution takes approximately 365 days and 6 hours (1 year)
- Earth's revolution causes the changing view of night sky throughout the year
Seasons on Earth
- Seasons occur due to Earth's tilted axis (not due to distance from Sun)
- Earth's axis is tilted at about 23.5° and maintains this tilt throughout its orbit
- When Northern Hemisphere tilts toward Sun, it experiences summer; Southern Hemisphere experiences winter
Solar Eclipse
- Solar eclipse occurs when Moon comes between Earth and Sun, blocking sunlight
- Moon can block Sun completely despite being smaller because it's much closer to Earth
- Apparent size depends on both actual size and distance from observer
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Sources & Official References
- NCERT Official — ncert.nic.in
- CBSE Academic — cbseacademic.nic.in
- CBSE Official — cbse.gov.in
- National Education Policy 2020 — education.gov.in
Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.
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