The ecliptic can be defined as
a. the plane that is perpendicular to the Earth's axis of rotation.
b. the projection of the Earth's equator onto the sky.
c. the path traced out by the Moon in our sky in one month against the background stars.
d. the path traced out by the Sun in our sky over one year against the background stars.
Question 2
The Moon's angular diameter in our sky as observed from Earth is measured to be 0.5. From this, we can find the diameter of the Moon in kilometers if we also know the Moon's
a. distance from the Earth.
b. element composition
c. distance from the Sun.
