1. What types of motion ?
There are two types of motion.
1. Revolution
2. Rotation
2. What is rotation ?
The movement of the earth on its axis.
3. What is revolution ?
the movement of the earth around the sun in a fixed path on orbit is called revolution.
It takes 365 and one quarter days to revolve around the sun.
4. What do you think with orbital plane ?
1. The plane formed by the orbit is known as the orbital plane.
2. The axis of the earth which is as imaginary line.
3. Makes an angle of one half 66° with its orbital plane.
5. How does the earth receive light ?
1. The earth receives light from the sun. due to the spherical shape of the earth.
2. Only half of it gets light from the sun at a time.
6. What is circle of illumination ?
The circle devides the day from night on the globe is called the circle of illumination.
7. What is earthday ?
The earth takes about 24 hour to complete one rotation around it axis. This period of rotation is known as the earthday.
8. What would be condition of the earth, where life would not be possible ?
The portion of the earth facing the sun would always experience day, thus bringing continuous warmth to reason the other half would remains in darkness and freezing cold all the times.
9. Who were the earliest astronomer who spoke about the meaning of earth ?
The first earliest astronomer Aryabhatt had started that the earth is round and rotates on its own axis.
10. What do understand by leap year ?
February is of 29 days instead of 28 days such a year with 366 days is called leap year.
11. Who is the elliptical orbit ?
The earth is going around the sun is an elliptical orbit.
The throughout its orbit the earth is inclined in the same direction.
12. By what type the year is divided ?
1. Earth is usually divided into summer, winter, Spring and autumn season.
2. Season change due to the change in the position of earth around the sun.
13. In what area does the sun have the more heat on June 21 ?
On 21st June the northern hemisphere is tilted towards the sun, as a result they are receive more heat.
14. For what reason sunlight falls short on polar region ?
The areas near the poles receive less heat as the rays of the sun are slating.
15. In what area is always day until 6 month ?
The north pole is inclined towards the sun and the places beyond the Arctic circle experiences continuous day light for 6 months.
16. What is condition of northern hemisphere and South hemisphere ?
1. A larger portion of the northern hemisphere is getting light from the sun, it is summer in the region north of the equator.
2. At time South hemisphere all this condition are reversed, it is winter season there.
17. On what day is the big day from all and the night is small ?
The longest day and shortest night at occur on 21th June.
18. What is solstice ?
The night are longer than the days the position of the earth is called the summer solstice.
19. What is winter solstice ?
It is summer in the southern hemisphere with longer days and shorter nights. This position of the earth is called the winter solstice.
Christmas is celebrated in Australia in the summer season.
20. What is equinox ?
On 21st march and September 23rd direct rays of the sun fall on the equator. all this position neither the poles is tilted towards the sun. So the whole earth expressions equal days and equal Nights.
21. What conditions occur in the month of September and march in the north hemisphere and south hemisphere ?
1. on September it is autumn season in the north hemisphere and a spring season in the south hemisphere
2. Its opposite case on 21 march, it is autumn season in the south hemisphere and spring season in the north hemisphere.
Fact :-
1. On 22nd December the tropic of Capricorn receive direct rays of the sun has the South pole tilts towards it. As the sun's rays for vertically at the tropic of Capricorn (23 1/2° South )
2. As a larger portion of the southern hemisphere gets light.
