The Bris sextant /ˈbriːs/, or Bris Mini-Sextant, is not a sextant proper, but is a small angle-measuring device that can be used for navigation.[1][2] The Bris is, however, a true reflecting instrument which derives its high accuracy from the same principle of double reflection which is fundamental to the octant, the true sextant, and other reflecting instruments. It differs from other sextants primarily in being a fixed angle sextant, capable of measuring a few specific angles.[3]
- ^ Nenninger, Garet G. (April 2000). "Easily Constructed Mini-Sextant Demonstrates Optical Principles" (PDF). Archived (PDF) from the original on November 23, 2024. Retrieved November 22, 2024.
- ^ "The world's smallest Sextant: Bris-Minisextant". Cassens & Plath. Archived from the original on October 11, 2007.
- ^ Villmoare, Brian (2022-01-01). "Determination of latitude by two fixed-altitude sightings". Journal of Navigation. 75 (4): 805–812. doi:10.1017/S0373463322000406. ISSN 0373-4633.