Answered You can hire a professional tutor to get the answer.
(39) Give the three conditions needed for a TOTAL solar eclipse, noting the moon's phase, position on ecliptic, and distance from earth.
1. (39) Give the three conditions needed for a TOTAL solar eclipse, noting the moon's phase, position on ecliptic, and distance from earth.
2. (21-23) Describe changes in the noon Sun's altitude and days' duration in Tennessee from summer to winter solstice.
3. (23) Define perihelion and aphelion for our orbit, note the dates these points occur, and describe how it impacts our present day seasons. Explain why.
4. (56-57) Describe how Ptolemy's model accounted for retrograde motion; note the problem it has with the placement of Venus and Mercury.
5. (59-60) Contrast the Copernican explanation for retrograde motion with the geocentric model, and how the retrograde motions of Mercury and Mars occur at different places in their orbit and in the observable sky.
6. (3-5) Given that the Sun lies 8 light minutes distant, and the next brightest star in the sky, Sirius, lies eight light years distant, calculate the ratio of the distances to them; express your answer in scientific notation, and show your work.
7. (6-7) Comparing their sizes and average separations, which of these are most likely to collide: planets, stars, or galaxies. Explain why in terms of theirs sizes and separations in chapter 1.
8. (17) Memphis lies at about 90 degrees West Longitude, and 34 degrees N latitude. Which of these would help you locate Polaris in the night sky? Why? What happens to Polaris' position over the course of several hours?
9. (19) If you want to build an observatory where you can observe all the stars in the sky, where on the earth should you plan to locate it? Why?
10. (18) Given your latitude is 34 degrees SOUTH, could you see Polaris? The Big Dipper? Orion? The Southern Cross?
11. (56) What observational proof did the ancient Greeks cite to prove that earth could not be revolving around the Sun, and how did telescopic observations about 1840 in turn use this same shift over six months to prove that Copernicus was right?
12. (55) Use Erastothenes' method to calculate the circumference of the Little Prince's asteroid home on Ceres, given that this largest asteroid is spherical, and that he observes Sirius directly above his equator one day, then when he moves due north 150 kilometers, he now finds the same star only 72 degrees high at exactly the same time of day. Show your calculations.
13. (67-69) Name three telescopic discoveries Galileo made looking through this eyepiece, and cite how he used any one of them in support of the Copernican model.
14 (17-20). Why is Polaris, even in historic times, not always the "pole star"? Who was the pole star when the Egyptians built the Pyramids 5,000 years ago. When does Polaris get another chance?
15. (64) What clue to Kepler's first law is offered by the oppositions of Mars, according to Tycho?
16. (40) Explain why the solar eclipse of May 20, 2012 was annular, but the eclipse of August 21, 2017 will be total. Note why a total eclipse is much more interesting visually than an annular one.
17. (36) Explain the color of the totally eclipsed moon; relate this to our own atmosphere.
18. (82) Define orbital and escape velocity for the earth, and describe their mathematical relationship. Which applies to the International Space Station, and which to Voyager I?
19. (88) Contrast spring and neap tides in terms of the Sun and Moon's positions.
20. (155) You observe a sunspot in the center of the sun last Monday, but a week later it is on the Sun's western limb. Calculate the rotation period of the sun's equator. Show your work.
