Astronomy Crossword Puzzle

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Across
  1. 3. - Any theory of the structure of the solar system (or the universe) in which earth is assumed to be at the center of it all.
  2. 5. - An imaginary line through earth
  3. 7. - It is the shape of the earth and some other planets. It's is like a sphere squashed from the top so the diameter from pole to pole is less than the diameter from equator to equator.
  4. 10. - shrinking; describes the moon when the illuminated portion is descreasing.
  5. 16. - Are three scientific laws describing the motion of planets around the Sun, by Johannes Kepler.
  6. 17. - Earth’s path in space.
  7. 18. - A moment when the sun's path in the sky is farthest south in the Northern Hemisphere or farthest north in the Southern Hemisphere.
  8. 21. - An obscuring of the light from one celestial body by the passage of another between it and the observer or between it and its source of illumination
  9. 23. - A Greek philosopher who computed the circumference of the earth and who gave the most accurate size during their time.
  10. 26. - The perimeter of a circle or ellipse.
  11. 29. - A representation of the sun-Earth-moon system.
  12. 30. - The astronomical model in which the earth and planets revolve around the sun at the center of the solar system.
Down
  1. 1. - His accurate measurements of Mars were his greatest contributions to astronomy.
  2. 2. - The figure of the moon that appears as a curve with pointy ends.
  3. 4. - Dark region of the Sun due to lower temperature.
  4. 6. - A natural object that orbits a larger object.
  5. 8. - The longest day of the year. In the Northern Hemisphere it is in June, while in the Southern Hemisphere it's in December.
  6. 9. - Developed and formalized Galileo’s concept of inertia.
  7. 11. - He was the greatest Italian scientist of the Renaissance. Due to the telescope, he was able to discover and observe important astronomical facts such as lunar craters, the phases of the Venus, the moon's of Jupiter, sun spots, and the sizes of the stars.
  8. 12. - A student of Plato and considered as one of the great philosophers of his time; his earth-centered view dominated for almost 2,000 years.
  9. 13. - a dark (real image) area where light from light source is blocked by an opaque object.
  10. 14. - It claims that the planets moved in a complicated system of circles. This model also became known as the Ptolemic System.
  11. 15. - It was believed to be in fixed position in the sky. However, when the Greeks traveled to places nearer the equator, like Egypt, they noticed that it is closer to the horizon.
  12. 19. - Discovered by Galileo to look at the moon, discover the four satellites of Jupiter, observe supernova, and discover sunspot.
  13. 20. - They are much noted for their contributions in different fields. They were not only great philosophers but great scientists and mathematicians as well.
  14. 22. - growing; describes the moon when the illuminated portion is descreasing.
  15. 24. - Earth does this around the sun once a year.
  16. 25. - Developed a heliocentric system where in the orbits were elliptical rather than circular. This advanced the Sun-centered view.
  17. 27. - Justified his Earth-centered model and explained retrograde motion through cycles and epicycles.
  18. 28. - A displacement or difference in the apparent position of an object viewed along two different lines of sight, and is measured by the angle or semi-angle of inclination between those two lines.