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Unit A Test Review
Earth, Moon and the Sun
| Question | Answer |
|---|---|
| Totality | a completely eclipsed moon |
| Waxes | the illuminated portion of the Moon increases |
| Apogee | the farthest point in the Moon's orbit |
| Sidreal period | the orbital period with respect to the stars of about 27 days |
| Umbra | the region of total shadow |
| Perigee | the closest point in the Moon's orbit |
| Synodic Period | A complete cycle of Lunar phases of 29.53 days |
| Penumbra | the region of partial shadow where sunlight is dimmed |
| wanes | the illuminated portion of the moon decreases |
| nodes | the two points at which the Moon's orbit crosses the ecliptic |
| F | the moon moves slowly against the background of the constellations |
| F | any location on the moon is sunlit for 3 weeks and is in darkness for one week as the moon rotates |
| T | in most months, there are no eclipses |
| F | as the illuminated part of the moon grows larger from new to full, it is said to "wane" |
| T | Our calendar divides the year into 30-day periods in recognition of the synodic cycle of the Moon |
| F | when the Moon is totally eclipsed, the Moon is illumintaed by some sunlight reflected by Earth's atmosphere |
| T | when the full moon passes through Earth's shadow, the eclipse is visible from anywhere on Earth's dark side |
| F | the geometry of a solar eclipse is the same as that of a lunar eclipse |
| T | A "Larger" moon on the horizon is an optical illusion |
| F | to see a solar eclipse, you have to be in Earth's shadow |
| T | the angular diameters of the Moon and Sun vary slightly because the orbits of the Moon and Earth are slightly elliptical |
| T | predicting an eclipse is easy because all you have to do is keep track of where the moon crosses the ecliptic |
| T | one cycle of Moon phases takes 29.5 days |
| T | We always see only one side of the Moon |
| T | 1st quarter and 3rd quarter Moons are at 90 degree angles from the Earth-Sun line. |
| The daily motion of the Sun, Moon and stars is called: | Diurnal Motion |
| in its daily motion across the sky, in the Northern Hemisphere, the Sun reaches its highest point in which direction? | the South |
| What causes seasons on Earth? | The tilt of Earth's axis |
| The smooth, dark areas on the Moon are best described as? | Lava plains |
| What is a true statement about the moon? | From Earth, we always see the same side of the moon |
| The Moon goes through all of its phases approximately? | Once a Month |
| The Moon appears brightest to us at what phase? | Full Moon |
| A solar eclipse can only occur at what phase of the Moon? | New Moon |
| A Lunar eclipse can only occur at what phase of the Moon? | Full Moon |
| The length of time a total solar eclipse lasts is usually measured in? | Minutes |
| What is a true statement about lunar eclipses? | They can be seen from an entire hemisphere on Earth |
| Which part of the sun becomes visible during a total solar eclipse? | The corona |
| What does a waning crescent moon mean? | the changing moon between 3rd quarter and new moon |
| What does a waxing gibbous moon mean? | the changing moon between 1st quarter and Full moon |
| What gives the Moon a coppery glow during a total eclipse? | Sunlight refracted through Earth's atmosphere |
Created by:
jdgee
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