Vayudoot Aviation

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

Beginning of January

Beginning of July

End of December

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

Earth's rotation.

Inclination of the ecliptic to the equator.

Relative speed of the sun along the ecliptic.

3. The mean sun

Is only of interest to users of astronomical navigation.

Moves with constant speed along the celestial equator.

Is the middle position of the sun.

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

varying with the season of the year.

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

of 66°33' with the plane of the path.

5. The term Aphelion is used to describe

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.

The relative position between the earth and the moon.

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

68°

66°

72°

7. Seasons are due to the

Earth's rotation on its polar axis

Earth's elliptical orbit around the Sun

inclination of the polar axis with the ecliptic plane

8. Sun will appear at same latitude

Once a year

Once a day

Twice a year

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

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

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

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

10. 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.

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

Beginning of July

End of June

Beginning of January

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

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

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

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

13. Civil twilight is defined by

sun altitude is 6° below the celestial horizon

sun altitude is 12° below the celestial horizon

sun altitude is 18° below the celestial horizon

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

23.5°

66.5°

27.5°

15. All heavenly bodies rise

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

In the East.

In the West.

16. 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?

66°

23°

45°

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