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gptkbp:instanceOf
|
scientific instrument
|
|
gptkbp:accuracy
|
0.2 arcminutes
|
|
gptkbp:calibration
|
index error adjustment
|
|
gptkbp:category
|
gptkb:astronomy
gptkb:navigation
surveying
|
|
gptkbp:component
|
astronomer
arc
mirrors
filters
clamp
graduated scale
index arm
micrometer drum
vernier
|
|
gptkbp:displayedAt
|
gptkb:National_Maritime_Museum
|
|
gptkbp:etymology
|
Latin 'sextans' meaning 'one sixth'
|
|
https://www.w3.org/2000/01/rdf-schema#label
|
Sextant
|
|
gptkbp:introducedIn
|
1731
|
|
gptkbp:inventedBy
|
gptkb:John_Hadley
gptkb:Thomas_Godfrey
|
|
gptkbp:material
|
gptkb:plastic
brass
aluminum
|
|
gptkbp:measures
|
altitude of celestial bodies
angle between two visible objects
|
|
gptkbp:notableExample
|
gptkb:C._Plath_sextant
gptkb:Heath_&_Co._sextant
gptkb:Tamaya_sextant
|
|
gptkbp:range
|
60 degrees
|
|
gptkbp:relatedTo
|
gptkb:backstaff
gptkb:octant
gptkb:theodolite
astrolabe
chronometer
|
|
gptkbp:replacedBy
|
gptkb:octant
electronic navigation systems
|
|
gptkbp:requires
|
natural satellite
clear view of horizon
|
|
gptkbp:usedBy
|
aviators
mariners
navigators
|
|
gptkbp:usedFor
|
celestial navigation
chronometer
measuring angles
nautical almanac
sight reduction tables
|
|
gptkbp:usedIn
|
marine navigation
land surveying
aerial navigation
|
|
gptkbp:bfsParent
|
gptkb:Head_Hunters
|
|
gptkbp:bfsLayer
|
5
|