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Chapter 1

Chapter 1. a stro1010-lee.com. Survey of Astronomy. twlee2016@gmail.com. Chapter 1. a stro1010-lee.com. Survey of Astronomy. twlee2016@gmail.com. Chapter 1. Astronomy -- Study of the Universe Universe -- everything that exists. Solar System Planets Moons Asteroids Comets

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Chapter 1

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  1. Chapter 1 astro1010-lee.com Survey of Astronomy twlee2016@gmail.com

  2. Chapter 1 astro1010-lee.com Survey of Astronomy twlee2016@gmail.com

  3. Chapter 1 Astronomy -- Study of the Universe Universe -- everything that exists • Solar System • Planets • Moons • Asteroids • Comets • Other debris • Earth/Moon System • Galaxy • The Milky Way is our Galaxy • Stars • Open Star Clusters • Globular Star Clusters • Nebulae • Sun • Solar System astro1010-lee.com Survey of Astronomy twlee2016@gmail.com

  4. Chapter 1 Subtend When an object just fills an angle it subtends that angle. astro1010-lee.com Survey of Astronomy twlee2016@gmail.com

  5. Chapter 1 Angular Units Degree (of arc) = 1/360 Circle Minute (of arc) = 1/60 of a Degree Second (of arc) = 1/60 of a Minute Hour (of arc) = 360/24 = 15 degrees astro1010-lee.com Survey of Astronomy twlee2016@gmail.com

  6. Chapter 1 Distance Measure in Space astro1010-lee.com Survey of Astronomy twlee2016@gmail.com

  7. Chapter 1 OUR CODE The Earth and the entire Universe obey a single set of Laws astro1010-lee.com Survey of Astronomy twlee2016@gmail.com

  8. Chapter 1 Scientific Theory and the Scientific Method Scientific theories: must be testable must be continually tested should be simple should be elegant Scientific theories can be proven wrong, but they can never be proven right with 100% certainty astro1010-lee.com Survey of Astronomy twlee2016@gmail.com

  9. Chapter 1 Scientific Theory and the Scientific Method • Observation leads to theory explaining it • Theory leads to predictions consistent with previous observations • Predictions of new phenomena are observed. If the observations agree with the prediction, more predictions can be made. If not, a new theory can be made. astro1010-lee.com Survey of Astronomy twlee2016@gmail.com

  10. Chapter 1 Early Discoveries • Pre-historic • Sun • Moon • Stars • Constellations • Planets • Movement of the Sky • Path of the Sun • Movement of the Moon • Historic • Cyclic nature of the Universe ….. led to calendars • Explanation of the phases of the Moon • NCP • Celestial Equator • Explanation of the seasons astro1010-lee.com Survey of Astronomy twlee2016@gmail.com

  11. Chapter 1 Earth’s Orbital Motion Daily cycle, noon to noon, is diurnal motion – solar day Stars aren’t in quite the same place 24 hours later, though, due to Earth’s revolution around Sun; when they are, one sidereal day has passed astro1010-lee.com Survey of Astronomy twlee2016@gmail.com

  12. Chapter 1 From season to season the stars that we see change. This is because of the motion of the Earth in it orbit. The ancients thought it was because the Sun moved around the Earth astro1010-lee.com Survey of Astronomy twlee2016@gmail.com

  13. Chapter 1 The 12 constellations that the Sun appears to move through during the year are called the zodiac; the apparent path is the ecliptic astro1010-lee.com Survey of Astronomy twlee2016@gmail.com

  14. Chapter 1 The Earth revolves around the Sun once each year causing the Sun to appear to move around the sky astro1010-lee.com Survey of Astronomy twlee2016@gmail.com

  15. Chapter 1 • Time from one vernal equinox to next is tropical year • Combination of day length and sunlight angle gives seasons astro1010-lee.com Survey of Astronomy twlee2016@gmail.com

  16. Chapter 1 Precession: rotation of Earth’s axis itself; makes one complete circle in about 26,000 years astro1010-lee.com Survey of Astronomy twlee2016@gmail.com

  17. Chapter 1 The Terrestrial Coordinate System Latitude is measured north and south from the equator Longitude is measured east and west from the prime meridian astro1010-lee.com Survey of Astronomy twlee2016@gmail.com

  18. Chapter 1 Zenith is the point directly overhead Meridian is the line from the north point through the zenith and on to the south point. Horizon is the line on the sky made by the plane that is perpendicular to the vertical line from you to the zenith astro1010-lee.com Survey of Astronomy twlee2016@gmail.com

  19. Chapter 1 The Celestial Coordinate System Reference points and planes on Celestial Sphere astro1010-lee.com Survey of Astronomy twlee2016@gmail.com

  20. Chapter 1 The Celestial Coordinate System Right Ascension (RA) or Hour Angle is measured from the point on the sky where the Sun is at the Spring Equinox Declination (δ) is measured north or south from the Celestial Equator astro1010-lee.com Survey of Astronomy twlee2016@gmail.com

  21. Chapter 1 Go to Chapter 2 astro1010-lee.com Survey of Astronomy twlee2016@gmail.com

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