Astronomy Lecture 2

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Across
  1. 2. Point on the celestial sphere directly underneath
  2. 3. Differential gravitational forces exerted by the Sun and Moon cause Earth to do this
  3. 4. the sun also crosses this equinox heading south
  4. 5. some stars near Polaris move in this shape
  5. 7. the sun crosses the celestial equator at this equinox heading north
  6. 9. this solar time is determined by the suns position
  7. 10. this day is shorter than the solar day
  8. 12. The point directly overhead
  9. 13. type of year that Earth takes to orbit the Sun relative to the 'fixed’ (distant) stars
Down
  1. 1. These stars circle the celestial poles
  2. 2. this traces a circle on the sky, once every 26,000 years
  3. 6. Position North or South of the equator
  4. 7. Tropical (or Solar) year – Sun returns to position of this equinox
  5. 8. only circumpolar stars are present in this sky
  6. 11. position east or west of prime meridian(runs through Greenwich,England)