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- 1. Multiple Choice
Daily motion that repeat on a 24 hour cycle are called ___ motions. Examples are sunrise and sunset, moonrise and moonset, and the rising and setting of the planets.
proper
diurnal
rotational
precession
- 2. Multiple Choice
Ptolemy used epicycles to explain the motions of the sun, moon, and planets in his ____ model of the solar system. that had everything orbiting Earth.
heliocentric
geocentric
orrery
- 3. Multiple Choice
According to Kepler's 1st Law, planets orbit the sun in _____ orbits.
circular
oval
elliptical
epicycle
- 4. Multiple Choice
Earth has a variety of motions. It orbits the sun, with a period of 1 year. It rotates on it's axis once a day. It also "wobbles" on its axis over a period of 26,000 years. Currently our north pole points at Polaris. In the distant past, it pointed at Thuban, in the constellation Draco. This "wobble" is called _____.
nutation
precession
retrograde motion
- 5. Multiple Choice
What is an astronomical unit?
a light year
a parsec
the average distance from the Earth to the Sun
the average distance from the Earth to the Moon
- 6. Multiple Choice
How long is the period of Earth's revolution?
one day
one month
one year
- 7. Multiple Choice
When does the Earth have the highest speed - when close to the sun, or when far from the sun?
close to
far from
- 8. Multiple Choice
Which planet has an orbit with the lowest eccentricity?
Mercury
Venus
Earth
Mars
- 9. Multiple Choice
When a planet is at perihelion it is ___.
closest to the sun in its orbit
farthest from the sun in its orbit
- 10. Multiple Choice
In orbits with low eccentricity ___.
The foci are far apart
The foci are close together
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