Class 7 Science - ODISHA
Earth, Moon and the Sun
The chapter 'Earth, Moon and the Sun' for Class 7 students under the Odisha Board (BSE) explores the fascinating celestial relationships in our solar system. Students will learn about the movements of the Earth and the Moon, including rotation and revolution, and how these movements cause day and night, seasons, and phases of the Moon. Additionally, the chapter covers eclipses—both solar and lunar—explaining how shadows are formed in space. Understanding these concepts is essential for board exams as they form the foundational astronomy knowledge tested frequently through conceptual and diagram-based questions.
Start Learning FreeKey Concepts
Rotation of the Earth
The spinning of the Earth on its imaginary axis from west to east, which takes 24 hours and causes day and night.
Revolution of the Earth
The movement of the Earth around the Sun in a fixed elliptical orbit, which takes 365 and 1/4 days and causes changes in seasons.
Phases of the Moon
The different shapes of the illuminated part of the Moon as seen from Earth, changing over a period of about 29.5 days due to its revolution around the Earth.
Solar Eclipse
A phenomenon that occurs when the Moon comes directly between the Sun and the Earth, casting a shadow on the Earth during the day.
Lunar Eclipse
A phenomenon that occurs when the Earth comes directly between the Sun and the Moon, casting its shadow on the Moon during a full moon night.
Important Formulas
Board Exam Info
In the Odisha BSE Class 7 Science examinations, this chapter typically carries around 6 to 8 marks. Questions usually include short answers, fill-in-the-blanks, differences between rotation and revolution, and diagram-based questions on solar and lunar eclipses.
Frequently Asked Questions
What is the main difference between rotation and revolution?
Rotation is the spinning of an object on its own axis (like a top), while revolution is the movement of an object around another object in an orbit (like the Earth around the Sun).
Why do we see different phases of the Moon?
We see different phases because the Moon revolves around the Earth, and the amount of the Sun's light reflected by the Moon's surface towards our view changes daily.
Can we look at a solar eclipse with naked eyes?
No, looking directly at a solar eclipse can permanently damage your eyes because the Sun's harmful UV rays are still intense. Special solar filters or eclipse glasses must be used.
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