Green Pi Day

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Across
  1. 1. Shared a raft with Pi (5)
  2. 6. Quantifies Pi and pie (8)
  3. 9. A precious place on earth (14)
  4. 11. Popeye's strength provider (7)
  5. 12. Irish dry stout (8)
  6. 14. Eco-friendly (5)
  7. 16. Little green man (10)
  8. 17. "Life of Pi" author (6)
  9. 18. Traditional British pie (4,3)
  10. 20. "But February made me...." (Lyric) (6)
  11. 21. Where the Shannon flows (7)
  12. 22. Irish symbol of love, loyalty and friendship (8)
Down
  1. 2. A genius, relatively speaking (also born on Pi day) (8)
  2. 3. Greenish-blue (4)
  3. 4. Iconically Australian (4,3)
  4. 5. Rare to find and brings good luck (4,4,6)
  5. 6. "American Pie" songwriter (3,6)
  6. 7. Known to swoop (6)
  7. 8. Distinguishes a French from a Dutch apple pie (7)
  8. 10. Lemon pie topping (8)
  9. 11. Pie in the face sound (5)
  10. 13. Private investigator (P.I) (6)
  11. 15. Cannot be expressed as a simple fraction (10)
  12. 19. Martini garnish (5)
  13. 23. Celtic language (6)