Six, Seven, Eight

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Across
  1. 2. a sixth of a circle; an instrument used to determine the position of a ship by measuring the positions of the stars and sun
  2. 6. a person who is between 70 and 70 years old
  3. 8. a flat shape that has eight sides and eight angles
  4. 9. a group of seven singers or musicians who perform together
Down
  1. 1. the tenth month of the year, formerly the eighth
  2. 3. a group of eight such as eight lines or eight musical notes
  3. 4. lasting for seven years; happening once every seven years
  4. 5. a 2-dimensional figure that has six angles and six sides
  5. 7. The ninth month of the year, formerly the seventh
  6. 8. a sea animal that has a soft body and eight long arms