---
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knowledge_type: "chapter"
entity_type: "chapter"
id: "69bff5aefb5daab696da821c"
title: "Earth, Moon, and the Sun"
board: "CBSE"
curriculum: "CBSE"
class: "Class 7"
subject: "Science"
book: "Curiosity"
chapter: "Earth, Moon, and the Sun"
chapter_slug: "earth-moon-and-the-sun"
canonical_url: "https://www.edzy.ai/cbse-class-7-science-curiosity-earth-moon-and-the-sun"
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source: "Edzy"
version: 1
last_updated: "2026-06-20"
---

# Earth, Moon, and the Sun
This chapter explores the relationship between the Earth, Moon, and Sun, emphasizing the effects of the Earth's rotation and revolution on natural phenomena such as day and night, as well as seasons and eclipses.

---

## Knowledge Snapshot
| Field | Details |
| :--- | :--- |
| Class | Class 7 |
| Subject | Science |
| Book | Curiosity |
| Chapter | Earth, Moon, and the Sun |
| Pages | 169-186 |

---

## Chapter Summary
### Short Summary
The chapter discusses how the Earth's motion influences products like day-night cycles and seasonal changes, incorporating multiple scientific observations.

### Detailed Summary
The chapter begins with Rashmika's observations about the changing length of shadows which leads to questions about the Sun's apparent motion. It explains the Earth's rotation on its axis, which causes the day-night cycle, and its revolution around the Sun, which leads to seasonal changes. Furthermore, it addresses eclipses, explaining the different types and the mechanics behind them, shedding light on both solar and lunar eclipses.

---

## Topic-Wise Explanation
### Rotation of the Earth
The Earth rotates on its axis, completing one rotation in about 24 hours. This rotation causes the Sun to appear to rise in the East and set in the West, creating the day-night cycle.

### Revolution of the Earth
The Earth revolves around the Sun in about 365 days and 6 hours, following a nearly circular orbit. This revolution, combined with the tilt of the Earth's axis, leads to seasonal variations throughout the year.

### Eclipses
Eclipses occur when the Moon or the Earth blocks sunlight. A solar eclipse happens when the Moon obstructs sunlight from reaching Earth, while a lunar eclipse occurs when Earth’s shadow falls on the Moon.

---

## Core Ideas
| Idea | Explanation |
| :--- | :--- |
| Earth's Rotation | Causes day and night as well as the apparent motion of celestial bodies. |
| Earth's Revolution | Affects seasonal changes, with the Earth completing one revolution around the Sun in approximately one year. |
| Eclipses | Solar and lunar eclipses occur due to the alignment of the Earth, Moon, and Sun, blocking sunlight in various ways. |

---

## Key Concepts
| Concept | Meaning |
| :--- | :--- |
| Rotation | The motion of the Earth on its own axis, resulting in day and night. |
| Revolution | The movement of the Earth around the Sun, giving rise to seasons. |
| Solar Eclipse | Occurs when the Moon blocks the Sun's light from reaching the Earth. |
| Lunar Eclipse | Happens when the Earth blocks sunlight from reaching the Moon. |

---

## Important Points for Revision
* The Earth rotates from West to East.
* There are approximately 24 hours in one complete rotation.
* Eclipses can be total or partial based on alignment.
* The Earth takes roughly 365.25 days to complete one revolution around the Sun.
* The tilt of the Earth's axis is responsible for the changing seasons.
* During summer solstice, the Northern Hemisphere experiences the longest day.
* The shortest day occurs during the winter solstice.
* The equinoxes result in nearly equal day and night durations.

---

## Vocabulary and Glossary
| Word / Phrase | Meaning |
| :--- | :--- |
| Eclipse | An event where one celestial body moves into the shadow of another celestial body. |
| Solstice | The time when the Sun is at its greatest distance from the celestial equator, resulting in the longest or shortest day. |

---

## Practice Questions
### Short Answer Questions
1. What causes day and night on Earth?
2. How long does it take for the Earth to complete one rotation?
3. What is a solar eclipse?
4. Explain the difference between a solar and a lunar eclipse.
5. Why do seasons change?

### Long Answer Questions
1. Describe the effects of the Earth's tilt on seasonal changes.
2. Explain the relationship between the Earth's rotation and the apparent motion of the Sun.
3. Discuss the causes and types of eclipses observed from Earth.

---

## Related Concepts
* Shadow length and solar position.
* Celestial observation and ancient astronomers.

---

## Source Attribution
| Field | Value |
| :--- | :--- |
| Source | Edzy |
| Reference Type | examSubjectBookChapter |
| Reference ID | 69bff5aefb5daab696da821c |
| Canonical URL | https://www.edzy.ai/cbse-class-7-science-curiosity-earth-moon-and-the-sun |
| Markdown URL | https://www.edzy.ai/okf/chapter/cbse-class-7-science-curiosity-earth-moon-and-the-sun.md |