3 adjectives to describe twelfth

Shell ovate, fusiform, white, polished; spire conical, nearly as long as the aperture, rather blunt; outer lip somewhat inflexed; columella with four distinct plaits; axis three-twelfths, diameter two-twelfths of an inch.

The whispering breeze on this delightful twelfth of June swept about the eaves of the church without a hint of danger.

You see, Jervis, we have photographed the thumb-print in contact with a numbered micrometer divided into square twelfths of an inch.

3 adjectives to describe  twelfth