Which of the following is true about the aphelion?

1. Occurs on 4 July.
2. Summer in northern hemisphere
3. Speed of revolution is maximum
4. All of the above.

Solstice : Summer/Winter :: ……………. : Spring/Autumn

1. Solstice
2. Equinox
3. Vernal
4. None of the above.

The period of diffused light between sunset and complete darkness is called ……………. .

1. dawn
2. dusk
3. twilight
4. Both (b) and (c)

The duration of twilight :

1. increases to the poles
2. might last for as much as 7 weeks at the poles
3. is as long as the sun is 18° below the horizon
4. all of the above.