arc-second
Degree's sixtieth's sixtieth
An arc-second is a unit of angular measurement equal to one-sixtieth of an arc-minute, or one 3,600th of a degree.
Used in astronomy, navigation, and geodesy where precise angles matter: The telescope can resolve objects separated by less than one arc-second.
Also written arcsecond.
Minute angular unit
- arcminute1/60th of a degree
- degreeUnit of measurement
- angleGeometric measure of rotation
- parallaxPosition change from different vantages
angular resolution · declination · radian · subtended · precision · calibration · astrometry · metrology
Maritime angular measurement device
- celestial navigationLocation-finding via astronomical observation
- latitudeGeographic or personal freedom
- longitudeEast-west angular distance
- altitudeMeasured height above reference
azimuth · nautical almanac · horizon · fix · dead reckoning · intercept · mariner · astrolabe
Interstellar length measure
- astrometryMeasuring celestial body positions
- epochDistinct historical period
- catalogOrdered list of items
- GaiaPrimordial earth deity
Adjustable optical inlet
- seeingPerceiving by sight
- diffractionWaves spreading past obstacles
- Airy diskLight's circular diffraction pattern
- interferometryMeasurement using wave combination patterns
baseline · eyepiece · focal length · detector
arcsecond
Minute angular unit
parallax · angular resolution · declination · radian · subtended · precision · calibration · astrometry · metrology · instrumentation
sextant
Maritime angular measurement device
- celestial navigationLocation-finding via astronomical observation
- latitudeGeographic or personal freedom
- longitudeEast-west angular distance
altitude · azimuth · nautical almanac · horizon · fix · dead reckoning · intercept · mariner · astrolabe · theodolite
parsec
Interstellar length measure
- astrometryMeasuring celestial body positions
- epochDistinct historical period
- catalogOrdered list of items
aperture
Adjustable optical inlet
- seeingPerceiving by sight
- diffractionWaves spreading past obstacles
- Airy diskLight's circular diffraction pattern
interferometry · baseline · eyepiece · focal length · detector
arc-seconddegree
Unit of measurement
full circle · radian · revolution · full rotation · steradian
arc, arcs, arced, arcing, arcuate, arcade, arch, arched, arches