Answer: octantal

AnswerCrossword Clue
octantalinstrument having an arc of 24┬░, used by navigators for measuring angles up to 90┬░
octantalrelating to an octant
octantalthe position of one heavenly body when 45┬░ distant from another
octantalany of the eight parts into which three mutually perpendicular planes divide space
octantalthe eighth part of a circle