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Fig. 4-20, p.68

Fig. 4-20, p.68. Orbits of planets and Moon. All revolutions in the same direction. Twinkling. The larger in angular diameter the less the twinkling. The larger size masks the twinkling. Jupiter. Sirius. Moon phases. Fig. 4-2b, p.56. Fig. 4-3a, p.56. Fig. 4-3b, p.57. Fig. 4-3b, p.57.

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Fig. 4-20, p.68

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  1. Fig. 4-20, p.68

  2. Orbits of planets and Moon All revolutions in the same direction

  3. Twinkling • The larger in angular diameter the less the twinkling. • The larger size masks the twinkling. Jupiter Sirius

  4. Moon phases Fig. 4-2b, p.56

  5. Fig. 4-3a, p.56

  6. Fig. 4-3b, p.57

  7. Fig. 4-3b, p.57

  8. Moon sidereal period is 27.3 days. Moon synodic period (i.e. full Moon to full Moon is 29.5 days. Fig. 4-5, p.57

  9. Moon orbit is tipped 5º with respect to ecliptic Fig. 4-6a, p.58

  10. Fig. 4-7, p.58

  11. Fig. 4-7, p.58

  12. Lunar eclipse, phase of Moon Full Fig. 4-9, p.59

  13. The angular size of the Sun and Moon are about ½º. Fig. 4-10, p.60

  14. Solar eclipse with diamond-ring effect Fig. 4-11, p.61

  15. Total solar eclipse, phase of Moon New Fig. 4-12, p.61

  16. Total solar eclipses from 2000 to 2020 Fig. 4-13, p.61

  17. The reason there is no eclipse every lunar month.

  18. Total Eclipses of the Moon

  19. Magnitude scale based on how the human eye sees. The higher the number the dimmer the object. A difference of Δm = 5 corresponds to a ratio of brightness of 100. A difference of Δm = 10 = 5 + 5 corresponds to a ratio of brightness of 100 × 100 = 10,000. A difference of Δm = 1 corresponds to a ratio of brightness of 2.5. Magnitude scale

  20. Apparent magnitude Fig. 4-15, p.64

  21. Coordinate Systems Constellations:A rough coordinate system of the Celestial Sphere. There are 88 constellations. Altitude: Angle above the horizon. Horizon -- 0º. Zenith: Straight up, -- 90º. Azimuth: Angle around the horizon. North = 0º; East = 90º; South = 180º; West = 270º. Latitude: Degrees north or south of the equator. North pole = +90º; Equator = 0º; South Pole = -90º. Tallahassee latitude = +30º. Longitude: The great circles that passes through the North Pole and South Pole. Measured in degrees from the circle that passes through Greenwich, England. Tallahassee longitude = 84ºW. Declination: The latitude fixed in the stars (Celestial latitude). North Pole = 90º; Celestial Equator = 0º; South Pole = -90º. Right Ascension:The longitude fixed in the stars. Units used are hours, minutes and seconds. The sky rotates one-hour unit per clock hour. 1 hour = 15º. Right ascension 0 hour is defined by the location of the Sun at Vernal equinox – about March 21, when the Sun is on the equator. Meridian: Imaginary line from North Pole to zenith to South Pole.

  22. Ecliptic and Zodiac

  23. Seasons

  24. Celestial sphere Fig. 4-22, p.69

  25. Midnight Sun in June from northern Norway Fig. 4-26, p.71

  26. Zero degree longitude in Greenwich England Fig. 4-28, p.72

  27. International time zones. Fig. 4-29, p.73

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