Earth's Place in the Universe

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Across
  1. 1. The period of revolution of the Moon with respect to the Sun; the length of one cycle of lunar phases; 29 1/2 Earth days.
  2. 4. A group of stars that forms a shape or pattern.
  3. 5. The blocking of sunlight to the moon that occurs when Earth is directly between the sun and the moon
  4. 6. A slow motion of Earth's axis that traces out a cone over a period of 26,000 years
  5. 7. The period of the Moon's revolution about Earth measured with respect to the stars
  6. 10. The different appearances of the Moon as it orbits Earth
  7. 12. Occurs when the Moon passes directly between the Sun and Earth and casts a shadow over part of Earth
  8. 14. The totality of space and everything in it
  9. 16. The time interval between one vernal equinox and the next
  10. 18. The time needed between successive risings of a given star - roughly 23 hours and 56 minutes.
  11. 19. The lighter part of a shadow where light is partially blocked
  12. 20. An apparent shift in the position of an object when viewed from different locations
  13. 21. The two days of the year on which neither hemisphere is tilted toward or away from the sun
  14. 22. The study of the moon, stars, and other objects in space
Down
  1. 2. Projection of Earth's North and South Poles onto the celestial sphere. Creates North and South celestial pole.
  2. 3. two days of the year on which one of the hemispheres is tilted towards the sun the most, and the other away.
  3. 8. A useful (although incorrect model) in which the stars were thought to be attached to a canopy surrounding and moving around the earth.
  4. 9. The time required for Earth to complete exactly one orbit around the Sun, relative to the stars.
  5. 11. A year, occurring once every four years, that has 366 days including February 29 as an intercalary day.
  6. 13. The distance that light travels in one year
  7. 15. Earth's rotation period as defined by the position of the Sun in the sky; the time between successive passages of the Sun through the meridian
  8. 16. Using Geometry to estimate a distance to an object based on angles and the distance between two observations.
  9. 17. The darkest part of the moon's shadow