Earth and Moon

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Across
  1. 2. the path that an object follows as it revolves around another object
  2. 3. a representation which displays some but not all aspects of an object or phenomenon
  3. 5. a set of connected parts that form a complex whole
  4. 6. a star that is always above the horizon when viewed from a given latitude
  5. 8. the motion of an object around another object in space
  6. 9. the latitudes furthest north and south that receive sunlight at a perpendicular angle
  7. 13. the appearance of the lit area of the moon as seen from Earth
  8. 15. a natural object in space
Down
  1. 1. a limitation on an engineering solution
  2. 4. a time of year when the sun is directly overhead at the equator at noon, when day and night are of equal length
  3. 5. a time of year when the sun is directly overhead at one of the tropics during noon
  4. 7. the plane in which an object’s orbit lies
  5. 10. the spin of an object around a point or line
  6. 11. the lunar phase where Earth is directly between the sun and the moon; the moon looks like a circle
  7. 12. the lunar phase where the moon is directly between Earth and the sun; the new moon cannot be seen from Earth
  8. 14. an imaginary line around which a rotating object turns