- bubble octant
- noun
: an octant using the same principle as a bubble sextant
Useful english dictionary. 2012.
bubble octant
Look at other dictionaries:
Octant (instrument) — Octant. This instrument, labelled Crichton London, Sold by J Berry, Aberdeen, appears to have an ebony frame with ivory scale, vernier and signature plate. The index arm and mirror supports are brass. Rather than use a sighting telescope, this… … Wikipedia
octant — An instrument similar to a bubble sextant but constructed with its arc graduated in degrees for an eighth of a circle. Frequently called a sextant. An octant can measure angles up to 90° … Aviation dictionary
Sextant — This article is about the sextant as used for navigation. For the astronomer s sextant, see Sextant (astronomical). : For the history and development of the sextant see Reflecting instruments A sextant is an instrument generally used to measure… … Wikipedia
celestial navigation — navigation by means of observations made of the apparent position of heavenly bodies. Also called astronavigation, celo navigation. [1935 40] * * * use of the observed positions of celestial bodies to determine a navigator s position. At… … Universalium
Celestial navigation — Celestial navigation, also known as astronavigation, is a position fixing technique that was devised to help sailors cross the featureless oceans without having to rely on dead reckoning to enable them to strike land. Celestial navigation uses… … Wikipedia
Measuring instrument — Captain Nemo and Professor Aronnax contemplating measuring instruments in Twenty Thousand Leagues Under the Sea … Wikipedia
18th century — The 18th century lasted from 1701 to 1800 in the Gregorian calendar, in accordance with the Anno Domini/Common Era numbering system. However, historians sometimes specifically define the 18th century otherwise for the purposes of their work. For… … Wikipedia
artificial horizon — 1. a level, as a surface of mercury, used in determining the altitudes of stars. Cf. level (def. 7). 2. the bubble in a sextant or octant for aerial use. 3. Also called flight indicator, gyro horizon. Aeron. an instrument that indicates the… … Universalium
artificial horizon — /ˌatəfɪʃəl həˈraɪzən/ (say .ahtuhfishuhl huh ruyzuhn) noun 1. a level reflector, as a surface of mercury, used in determining the altitudes of stars, etc. 2. the bubble in a sextant or octant for aerial use …
