Vayudoot Aviation

1. At what approximate date is the earth closest to the sun (perihelion)?

Beginning of July

End of June

Beginning of January

2. What is the highest latitude listed below at which the sun will reach an altitude of 90° above the horizon at some time during the year?

23°

45°

66°

3. What is the reason for seasonal changes in climate?

Because the distance between the Earth and the Sun varies over a year.

Because the Earth's orbital speed round the sun varies according to the time of the year.

Because the Earth's spin axis is inclined to 'the plane of its orbit round the Sun.

4. The direction of the Earths rotation on its axis is such that

Any point on the surface of the Earth will move eastward.

Any point on the surface of the Earth will move westward.

Observed from the point above the North Pole, the rotation is counter-clockwise.

5. When the length of the day is measured with reference to the passage of the apparent sun

The length of the day will wary in the course of the year.

The length of the day will vary with the latitude of the observer.

The length of the day will be the same once every month.

6. The term Aphelion is used to describe

The relative position between the earth and the moon.

The situation when the distance between the sun and the earth is at its longest.

The relationship between the length of the day and the length of the night.

7. Sun will appear at same latitude

Once a day

Twice a year

Once a year

8. All heavenly bodies rise

In the East.

Some in the East and some in the West depending upon the hemisphere.

In the West.

9. The angle between the plane of the ecliptic and the plane of equator is approximately

27.5°

66.5°

23.5°

10. At what approximate date is the earth furthest from the sun (aphelion)?

End of December

Beginning of July

Beginning of January

11. Which is the highest latitude listed below at which the sun will rise above the horizon and set every day?

68°

66°

72°

12. Seasons are due to the

inclination of the polar axis with the ecliptic plane

Earth's elliptical orbit around the Sun

Earth's rotation on its polar axis

13. In its path around the Sun, the axis of the Earth has an inclination

of 66°33' with the plane of the path.

varying with the season of the year.

varying between zero and 23° 27 with the plane of the pat

14. The main reason that day and night, throughout the year, have different duration, is due to the?

Relative speed of the sun along the ecliptic.

Earth's rotation.

Inclination of the ecliptic to the equator.

15. Civil twilight is defined by

sun altitude is 6° below the celestial horizon

sun altitude is 18° below the celestial horizon

sun altitude is 12° below the celestial horizon

16. The mean sun

Is only of interest to users of astronomical navigation.

Is the middle position of the sun.

Moves with constant speed along the celestial equator.

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