[{"n": "180th meridian", "u": "/e/lines-and-hemispheres/180th-meridian/", "s": "The 180th meridian divides hemispheres and anchors the International Date Line."}, {"n": "International Date Line", "u": "/e/lines-and-hemispheres/international-date-line/", "s": "Boundary between calendar days, roughly along 180° longitude."}, {"n": "Equator", "u": "/e/lines-and-hemispheres/equator/", "s": "Imaginary line dividing Earth into Northern and Southern Hemispheres."}, {"n": "Tropic of Cancer", "u": "/e/lines-and-hemispheres/tropic-of-cancer/", "s": "The northernmost circle where the Sun stands directly overhead."}, {"n": "Tropic of Capricorn", "u": "/e/lines-and-hemispheres/tropic-of-capricorn/", "s": "The southernmost latitude where the Sun can be seen directly overhead."}, {"n": "Antarctic Circle", "u": "/e/lines-and-hemispheres/antarctic-circle/", "s": "Southernmost major latitude circle marking the Antarctic region."}, {"n": "Circle of latitude", "u": "/e/lines-and-hemispheres/circle-of-latitude/", "s": "Parallel circles defining latitude on Earth."}, {"n": "Meridian (geography)", "u": "/e/lines-and-hemispheres/meridian-geography/", "s": "A line of longitude connecting points of equal longitude."}, {"n": "North Pole", "u": "/e/lines-and-hemispheres/north-pole/", "s": "Northernmost point on Earth, located in the Arctic Ocean."}, {"n": "South Pole", "u": "/e/lines-and-hemispheres/south-pole/", "s": "Southernmost point on Earth, marked by shifting ice and historic expeditions."}, {"n": "Celestial pole", "u": "/e/lines-and-hemispheres/celestial-pole/", "s": "Fixed points in the sky around which all stars appear to rotate."}, {"n": "Great circle", "u": "/e/lines-and-hemispheres/great-circle/", "s": "The largest circle on a sphere, analogous to a straight line."}, {"n": "Azimuth", "u": "/e/lines-and-hemispheres/azimuth/", "s": "Horizontal angle from north used in navigation and astronomy."}, {"n": "Cardinal direction", "u": "/e/lines-and-hemispheres/cardinal-direction/", "s": "Four main compass points used for navigation and orientation."}, {"n": "North", "u": "/e/lines-and-hemispheres/north/", "s": "One of the four cardinal directions, opposite south."}, {"n": "South", "u": "/e/lines-and-hemispheres/south/", "s": "One of the four cardinal directions, opposite north."}, {"n": "East", "u": "/e/lines-and-hemispheres/east/", "s": "Cardinal direction of sunrise, opposite west, abbreviated as E."}, {"n": "West", "u": "/e/lines-and-hemispheres/west/", "s": "Cardinal direction opposite east, where the Sun sets."}, {"n": "Eastern Hemisphere", "u": "/e/lines-and-hemispheres/eastern-hemisphere/", "s": "Half of Earth east of the prime meridian, encompassing Afro-Eurasia and Australia."}, {"n": "Western Hemisphere", "u": "/e/lines-and-hemispheres/western-hemisphere/", "s": "U.S. Department of Defense school for Latin American security personnel, formerly the School of the Americas."}, {"n": "Northern Hemisphere", "u": "/e/lines-and-hemispheres/northern-hemisphere/", "s": "The Northern Hemisphere contains most of the world's continents and major landmasses."}, {"n": "Southern Hemisphere", "u": "/e/lines-and-hemispheres/southern-hemisphere/", "s": "The Southern Hemisphere is Earth's southern half, mostly ocean."}, {"n": "Land and water hemispheres", "u": "/e/lines-and-hemispheres/land-and-water-hemispheres/", "s": "Earth's hemispheres maximizing land and ocean coverage, respectively."}, {"n": "Hemispheres of Earth", "u": "/e/lines-and-hemispheres/hemispheres-of-earth/", "s": "Equal halves of Earth divided by latitude, longitude, or cultural lines."}, {"n": "Geographic coordinate system", "u": "/e/lines-and-hemispheres/geographic-coordinate-system/", "s": "A spherical or geodetic coordinate system for measuring positions on Earth as latitude and longitude."}, {"n": "Geodetic datum", "u": "/e/lines-and-hemispheres/geodetic-datum/", "s": "A reference frame for unambiguously representing Earth positions."}, {"n": "Latitude", "u": "/e/lines-and-hemispheres/latitude/", "s": "Latitude specifies north-south position on Earth or celestial bodies."}, {"n": "Longitude", "u": "/e/lines-and-hemispheres/longitude/", "s": "The east-west coordinate that, with latitude, pinpoints any location on Earth."}]