Week 1 Lecture 6
Solutions at the bottom.

1)  In-video quiz at timepoint 02:15.

The Earth's axis is tilted by 23.5 degrees with respect to ____. 

a) the celestial equator
b) the celestial axis
c) the Earth's equator
d) the ecliptic

2)  In-video quiz at timepoint 14:10.

Which of the following options contribute to causing the seasons? Check all that apply. 

a) The height of the Sun above the horizon at noon.
b) The distance between the Earth and Sun during the Earth's orbit.
c) Atmospheric and ocean circulation of heat on Earth.
d) The duration of a day (the time the Sun is above the local horizon).

3)  In-video quiz at timepoint 14:42.

Altitude: the angular distance of a celestial object above the horizon.

Zenith Angle: the angle made between a line to the zenith and a line between the observer and the observed object on the sky.

Declination: the angular distance to an astronomical object, measured north or south from the celestial equator.

For further review, http://burro.cwru.edu/Academics/Astr306/Coords/coords.html.

Solutions:

1) The correct answer is d) the ecliptic
2) The correct answers are:
a) The height of the Sun above the horizon at noon.
d) The duration of a day (the time the Sun is above the local horizon).