#line.location a spatial location defined by a real or imaginary unidimensional extent
supertype: #location a point or extent in space
subtype: #part.line a line where the hair is parted; "his part was right in the middle"
subtype: #axis a straight line through a body or figure that satisfies certain conditions
subtype: #coordinate_axis one of the fixed reference lines of a coordinate system
subtype: #x-axis the horizontal axis in a plane coordinate system
subtype: #y-axis the vertical axis in a plane coordinate system
subtype: #z-axis the third axis in a 3-dimensional coordinate system
subtype: #major_axis the longest axis of an ellipse or ellipsoid; passes through the two foci
subtype: #semimajor_axis one-half the major axis of an ellipse; the distance from the center of an ellipse to one end
subtype: #minor_axis the shorter or shortest axis of an ellipse or ellipsoid
subtype: #semiminor_axis one-half the minor axis of an ellipse
subtype: #principal_axis__optic_axis a line that passes through the center of curvature of a lens so that light is neither reflected nor refracted
subtype: #aclinic_line__aclinicline__magnetic_equator an imaginary line paralleling the equator where a magnetic needle has no dip
subtype: #agonic_line an imaginary line connecting points on the Earth's surface where the magnetic declination is zero
subtype: #isogonic_line__isogonal_line__isogone an imaginary line connecting points on the Earth's surface where the magnetic declination is the same
subtype: #crest the top line of a hill, mountain, or wave
subtype: #timber_line__timberline__tree_line line marking the upper limit of tree growth in mountains or northern latitudes
subtype: #snow_line the line on a mountain above which there is perpetual snow and ice
subtype: #fault_line__faultline (geology) line determined by the intersection of a geological fault and the earth's surface
subtype: #great_circle__greatcircle a circular line on the surface of a sphere formed by intersecting it with a plane passing through the center
subtype: #celestial_equator__celestialequator__equinoctial_circle__equinoctialcircle__equinoctial_line__equinoctialline__equinoctial the great circle on the celestial sphere midway between the celestial poles
subtype: #right_ascension an arc of the celestial equator eastward from the vernal equinox
subtype: #ecliptic the great circle representing the apparent annual path of the sun; the plane of the Earth's orbit around the sun; makes an angle of about 23 degrees with the equator; "all of the planets rotate the sun in approximately the same ecliptic"
subtype: #equator an imaginary line around the Earth forming the great circle that is equidistant from the north and south poles; "the equator is the boundary between the northern and southern hemispheres"
subtype: #celestial_horizon__celestialhorizon__horizon the great circle on the celestial sphere whose plane passes through the sensible horizon and the center of the Earth
subtype: #hour_circle a great circle on the celestial sphere that passes through both celestial poles
subtype: #meridian__longitude__line_of_longitude an imaginary great circle on the surface of the earth passing through the north and south poles at right angles to the equator; "all points on the same meridian have the same longitude"
subtype: #observer's_meridian a meridian that passes through the observer's zenith
subtype: #prime_meridian__primemeridian meridian at zero degree longitude from which east and west are reckoned (usually the Greenwich (England) longitude)
subtype: #magnetic_meridian an imaginary line passing through both magnetic poles of the Earth
subtype: #date_line__dateline__International_Date_Line an imaginary line on the surface of the earth following (approximately) the 180th meridian
subtype: #vertical_circle a great circle on the celestial sphere passing through the zenith and perpendicular to the horizon
subtype: #hemline the line formed by the lower edge of a skirt or coat
subtype: #hipline.line the line formed by the lower edge of hip-length garment
subtype: #hipline the line formed by measuring the hip at its greatest part
subtype: #apparent_horizon__horizon__visible_horizon__visiblehorizon__sensible_horizon__skyline the line at which the sky and Earth appear to meet
subtype: #isogram__isopleth__isarithm a line drawn on a map connecting points having the same numerical value of some variable
subtype: #isobar an isogram connecting points having equal barometric pressure at a given time
subtype: #isochrone an isogram connecting points at which something occurs or arrives at the same time
subtype: #isohel an isogram connecting points receiving equal amounts of sunshine
subtype: #isotherm an isogram connecting points having the same temperature at a given time
subtype: #flight_line place where airplanes are parked and the maintenance hangars (but not the runways or taxiways)
subtype: #line_of_sight__line_of_vision a straight line along which an observer looks
subtype: #parallel_of_latitude__latitude__line_of_latitude__parallel an imaginary line around the Earth parallel to the equator
subtype: #polar_circle__polarcircle a line of latitude at the north or south poles
instance: #Antarctic_Circle #Arctic_Circle
subtype: #horse_latitude__horselatitude either of two belts or regions near 30 degrees north or 30 degrees south; characterized by calms and light baffling winds
subtype: #tropic either of two parallels of latitude about 23.5 degrees north and south of the equator representing the points farthest north and south at which the sun can shine directly overhead and constituting the boundaries of the torrid zone or tropics
instance: #Tropic_of_Cancer #Tropic_of_Capricorn
subtype: #lunar_latitude__lunarlatitude an imaginary line around the moon parallel to its equator
subtype: #itinerary__path__route an established line of travel or access
subtype: #feeder_line a branching path off of a main transportation line (especially an airline)
subtype: #main_line the principal route of a transportation system
subtype: #data_track__track (computer science) one of the circular magnetic paths on a magnetic disk that serve as a guide for writing and reading data
subtype: #air_lane__airlane__flight_path__airway a designated route followed by airplanes in flying from one airport to another
subtype: #approach_path__approach__glide_path__glidepath__glide_slope__glideslope the final path followed by an aircraft as it is landing
subtype: #traffic_pattern__trafficpattern__approach_pattern__pattern the path that is prescribed for an airplane that is preparing to land at an airport; "the traffic patterns around O'Hare are very crowded"; "they stayed in the pattern until the fog lifted"
subtype: #flight_path the path of an aircraft or rocket through the air
subtype: #beat.itinerary__round a regular route for a sentry or policeman; "in the old days a policeman walked a beat and knew all his people by name"
subtype: #bus_route__busroute the route regularly followed by a passenger bus
subtype: #line_of_flight the path along which a freely moving object travels through the air
subtype: #line_of_march.itinerary__lineofmarch the route along which a column advances
subtype: #celestial_orbit__celestialorbit__orbit the (usually elliptical) path described by one celestial body in its revolution about another; "he plotted the orbit of the moon"
subtype: #geosynchronous_orbit a circular orbit around the Earth having a period of 24 hours
subtype: #geostationary_orbit__geostationaryorbit a geosynchronous orbit that is fixed with respect to a position on the Earth
subtype: #electron_orbit__orbit the path of an electron around the nucleus of an atom
subtype: #beeline the most direct route; "he made a beeline for the bathroom"
subtype: #circuit.itinerary an established itinerary of venues or events that a particular group of people travel to; "she's a familiar name on the club circuit"; "on the lecture circuit"; "the judge makes a circuit of the courts in his district"; "the international tennis circuit"
subtype: #crosscut a diagonal path
subtype: #supply_line__supply_route a route over which supplies can be delivered
subtype: #line_of_fire the path of a missile discharged from a firearm
subtype: #migration_route__migrationroute__flyway the geographic route along which birds customarily migrate
subtype: #fairway.itinerary the usual course taken by vessels through a harbor or costal waters
subtype: #direction.itinerary__way a line leading to a place or point: "he looked the other direction"; "didn't know the way home"
subtype: #bearing.direction__heading__aim the direction or path along which something moves or along which it lies
subtype: #tack.bearing the heading or position of a vessel relative to the trim of its sails
subtype: #course.direction__trend general line of orientation: "the river takes a southern course"; "the northeastern trend of the coast"
subtype: #tendency.direction__trend a general direction in which something tends to move: "the shoreward tendency of the current"; "the trend of the stock market"
subtype: #trade_route__traderoute a route followed by traders (usually in caravans)
instance: #Silk_Road
subtype: #Northwest_Passage a water route between the Atlantic and the Pacific Oceans along the northern coast of North America; Europeans since the 16th century had searched for a short route to the Far East before it was successfully traversed by Roald Amundsen (1903-1906)
subtype: #quarter-circle__quartercircle__quadrant a quarter of the circumference of a circle
subtype: #rhumb_line__rhumbline__rhumb a line on a sphere that cuts all meridians at the same angle; the path taken by a ship or plane that maintains a constant compass direction
subtype: #danger_line a line beyond which it is dangerous to go
subtype: #side.line a line segment forming part of the perimeter of a plane figure; "the hypotenuse of a right triangle is always the longest side"
subtype: #waterline__water_line__waterline__water_level a line corresponding to the surface of the water when the vessel is afloat on an even keel; often painted on the hull of a ship
subtype: #load_line__Plimsoll_line__Plimsoll_mark__Plimsoll waterlines to show the level the water should reach when the ship is properly loaded
subtype: #water_line__waterline__watermark a line marking the level reached by a body of water
subtype: #high-water_mark a line marking the highest level reached
subtype: #low-water_mark__lowwatermark a line marking the lowest level reached
subtype: #watershed__water_parting__waterparting__divide a line that divides two adjacent river systems
subtype: #continental_divide__continentaldivide the watershed of a continent (especially the watershed of North America formed by a series of mountain ridges)
instance: #Great_Divide__Great_Dividing_Range
subtype: #path.line__track__course a line or route along which something travels or moves: "the hurricane demolished houses in its path"; "the track of an animal"; "the course of the river"
subtype: #collision_course.path__collisioncourse a course of a moving object that will lead to a collision if it continues unchanged
subtype: #inside_track.path__insidetrack the inner side of a curved racecourse
subtype: #round.path the course along which communications spread; "the story is going the rounds in Washington"
subtype: #steps__step the course along which a person has walked or is walking in; "I followed in his steps"; "he retraced his steps"
subtype: #swath.path__belt a path or strip (as cut by one course of mowing)
subtype: #trail.path a track or mark left by something that has passed; "there as a trail of blood"; "a tear left its trail on her cheek"
subtype: #slot.trail the trail of an animal (especially a deer)
subtype: #spoor the trail left by a person or an animal; what the hunter follows in pursuing game; "the hounds followed the fox's spoor"
subtype: #line_of_force__field_line__fieldline an imaginary line in a field of force; direction of the line at any point is the direction of the force at that point
subtype: #electrical_line_of_force a line of force in an electrical field
subtype: #magnetic_line_of_force a line of force in a magnetic field
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