1. The azimuth of the east cardinal point is. 2. The azimuth of the south cardinal point is. 3. The azimuth of the west cardinal point is.

Transcription

1 SELF TEST UNIT 2 1. The azimuth of the east cardinal point is. 2. The azimuth of the south cardinal point is. 3. The azimuth of the west cardinal point is. 4. The altitude of the zenith is. 5. Part of a great circle extending from the zenith and crossing the horizon at 90 o is the definition of a circle. 6. The meridian altitude of the north celestial pole as seen from 38 o north latitude is degrees. 7. The projection of the earth s equator upon the celestial sphere is the. 8. If you face Polaris, which way does the celestial sphere turn? 9. If the path a star takes during the night is such that the star could never rise or set, but would form a circle, all of which is above the northern horizon, the star is said to be _ 10. The daily path of a star is called the path. 11. The points about which the celestial sphere seems to rotate are called the north and south. 12. That part of a great circle that passes through the north and south cardinal points as well as your zenith is called the 13. The continuation of the circle in the above question that passes through the nadir is the 14. A great circle from celestial pole to celestial pole that is perpendicular to the celestial equator is called an. 15. If a star rises tonight at an azimuth of 60 o, it will rise tomorrow night at an azimuth of, and in a month s time it will rise at an azimuth of. 16. Declination of a star is measured from what circle? 17. In what units is declination measured?

2 18. The declination of Mintaka is about. 19. Look at your sky chart and write down Vega s declination. 20. Right ascension of a star is measured from along the celestial equator eastward. 21. The units of right ascension are. 22. The right ascension of Mintaka is about (use your sky chart) 23. The right ascension of Rigel is about (use your sky chart) 24. If a star has a positive declination, will it rise with an azimuth north or south of the east cardinal point? 25. If a star has zero declination, at what azimuth will it rise? 26. If a star rises with an azimuth of 100 o, at what azimuth should it set? 27. If the sun passes through lower transit, what time is it approximately? 28. Opposite the zenith lies the. 29. If a star transits your meridian tonight at 9:00 p.m., the star will transit your celestial meridian tomorrow night at 30. If a star is on your celestial meridian tonight at 10:00 p.m., tomorrow night at 10:00 p.m. that same star will be where relative to the celestial meridian? 31. Which of the following stars are circumpolar at D.V.C.? Star Dubhe Algol Mizar Betelgeuse Rigel Dec. 62 o 41 o 56 o 7 o -9 o 32. If a star is in transit at 8:00 p.m. tonight, where will it be at 9:00 p.m. tonight? 33. If a star is in transit at 8:00 p.m. tonight, where will it be at 11:00 p.m. tonight? 34. If a star is in transit at 8:00 p.m. tonight where will it be tomorrow night at 8:00 p.m.? 35. If a star is in transit at 8:00 p.m. tonight where will it be in 3 months at 8:00 p.m.?

3 36. If a star is in transit at 8:00 p.m. tonight, when will it transit tomorrow night? 37. If a star is in transit at 8:00 p.m. tonight, when will it transit in a month? 38. What is the meridian altitude of a star having a declination of 15 o at DVC? 39. How long will it be until a star goes through upper transit if its hour angle is 3 h? 40. How long will it be until a star goes through upper transit if its hour angle is -5 h? 41. What is the hour angle of a star which has a right ascension of 8 h 0 m at the sidereal time of 4 h?.

4 42. a) On the celestial sphere, draw and label the following: zenith, nadir, celestial meridian, anti-meridian, horizon, and the cardinal points. b) If the observer s latitude is 55 o N, draw and label the celestial equator, north and south celestial poles. c) Draw and label the vernal equinox if the sidereal time is 13 h 0 m. d) Draw and label the hour circle, vertical circle and star possessing the following coordinates: R.A. = 15 h 0 m and = 20 o.

5 43. Suppose you wish to observe the star Rigel at D.V.C. at a sidereal time of 2 h. The best way to figure out where to look (if you don t know your constellations!) is to plot it on a celestial sphere. a) draw and label the celestial equator, north and south celestial poles. c) Draw and label the vernal equinox. d) Draw and label the hour circle, vertical circle and star. Sample Essay Questions: 1State and explain the stars annual motion. 1) Explain why some stars are circumpolar. What is the relationship to the observer s position? 2) State and explain the stars diurnal motion. 3) Explain the pros and cons of the horizon coordinate system. 4) Explain the pros and cons of the celestial coordinate system. 5) Explain how one locates the vernal equinox. 6) Define right ascension, sidereal time and the hour angle and explain the relationship between them.