Matrix assignment - Crossword

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Across
  1. 4. my name
  2. 6. A telescope’s main light-gathering lens or mirror
  3. 11. The point in the sky that’s directly overhead
  4. 12. The imaginary north-south line that passes directly overhead (through the zenith).
  5. 13. A temporary dark blemish on the surface of the Sun that is a planet-size region of gas cooler than its surroundings
  6. 14. An increase in meteor activity at certain times of the year due to Earth passing through a stream of particles along a comet’s orbit around the Sun
  7. 17. Denotes an object near a celestial pole that never dips below the horizon as Earth rotates and thus does not rise or set
  8. 19. Any prominent star pattern that isn’t a whole constellation, such as the Northern Cross or the Big Dipper
  9. 20. The celestial equivalent of latitude, denoting how far (in degrees) an object in the sky lies north or south of the celestial equator
Down
  1. 1. The measure of how much an orbit deviates from being circular
  2. 2. The fraction of the Moon or other body that we see illuminated by sunlight
  3. 3. The edge of a celestial object’s visible disk
  4. 5. The time after sunset or before sunrise when the sky is not fully dark. Astronomical twilight ends after sunset (and begins before sunrise) when the Sun is 18° below the horizon.
  5. 7. A timetable with celestial coordinates that indicates where a planet, comet, or other body moving in relation to background stars will be in the sky
  6. 8. The changing illumination of the Moon (or other body)over time. The Moon waxes, growing more illuminated, between its new and full phases, and wanes, becoming less illuminated, between its full and new phases
  7. 9. A supermassive black hole gorging on gas at the center of a distant galaxy
  8. 10. When the Moon or other body appears more than half, but not fully, illuminated
  9. 15. The two times each year, near March 20th and September 22nd, when the Sun is directly overhead at noon as seen from Earth’s equator.
  10. 16. The two times each year, around June 20th and December 21st, when the Sun is farthest north or south in the sky
  11. 18. A star whose brightness changes over the course of days, weeks, months, or years