a. solar eclipses ideally occur about every _____ months. b. If we have a solar
ID: 112133 • Letter: A
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a. solar eclipses ideally occur about every _____ months. b. If we have a solar eclipse in February this year, when might we see the next solar eclipse? ____ a. the apparent angular size of the moon is about ____ degrees. The apparent angular size of the sun is about ____ degrees. b. the moon always appears large enough to cover the sun. T/F The shadow of the moon generally travels from _____ to _____ along the Earth's surface. (E to W/W to E) a. when the moon is relatively dose to Earth, we get a/an ____ solar eclipse. b. when the moon is farther from Earth, we see a/an ____ solar eclipse. a. to see a total eclipse, you would have to be in the _____ of the sun (what part of the shadow). b. if you are in the penumbra, you would see what kind of eclipse? ____ a. lunar eclipses can be observed day and night. _____ T/F b. why are lunar eclipses observed by more people than solar eclipses? Explain the timing: August 7, 2017 a partial lunar eclipse and August 21, 2017 a total solar eclipse July 2, 2019 a total solar eclipse and July 16, 2019 a partial lunar eclipse Why do we tend to see eclipses in bunches about every 6 months rather than at every new and full moon? The three laws of Johannes Kepler Using the graph of orbital period and average distance from the sun and the graph of average orbital speed and average distance, complete the following questions. About how fast is Jupiter orbiting the sun? An asteroid at 2 AU from the sun will have an orbital speed _____ (slower than Mars/ faster than Mars/the same speed as Mars) Uranus is about 19 AU from the sun. Though not on the graph, you could estimate the speed of Uranus at about _____. (20-25 km/sec, 15-20 km/sec, 10 to 15 km/sec, 5 to 10 km/sec) A planet that plots further up the red line from Saturn (above the 1000 mark on the horizontal axis) would have an orbital period of about ____ years. Remember, p^2 = a^3 and in this case a^3 = 1000. P^2 = 1000 so P = ? (1000, 100, 32, 10) Galileo Compare the two world systems, hat of Ptolemy and that of Copernicus. Explain: Galileo's observation of the phases of Venus demonstrated that the sun had to be at the center of the solar system. Thinking like an early astronomer: Hipparchus and seasons Use this link for times of the start of each season:Explanation / Answer
a. 18 months b. july --------------------------------------------------------------------------- 11.a) 31arcmin, 0.5 degrees b) false. Reason: the moon's apparent size is not always bigger than the sun, so during eclipse the sun will be visible behind the moon. --------------------------------------------------------------------------- 12. West to east.
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