octant /okˈtənt/

1. An arc of one-eighth of the circumference of a circle
2. A sector of one-eighth of a circle
3. An angle-measuring instrument with such an arc
4. A division of space or of a solid figure or body divided into eight by three planes, usu at right angles
5. A position 45º distant from another position, esp of the moon from conjunction or opposition (astronomy)

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