Gregorian Calendar

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Across
  1. 3. The time it takes for Earth to orbit the Sun once (4)
  2. 5. Assists in tracking seasons (8)
  3. 9. Gregorian calendar cycle repeats every ________ years (4,7)
  4. 10. Twelve in a year (5)
  5. 12. System of dating introduced in 1582 by Pope Gregory XIII (9)
  6. 13. A calendar based on the monthly cycles of the Moon's phases (5)
Down
  1. 1. Date added to February every four years (6,5)
  2. 2. 365 in a common year (4)
  3. 4. Month with 28 or 29 days (8)
  4. 6. Year with an extra day (4)
  5. 7. Gregorian is a modification of this calendar (6)
  6. 8. Period of seven days (4)
  7. 11. A solar calendar tracking four of these each year (7)