types:
raya
a line of scalp that can be seen when sections of hair are combed in opposite directions
eje
a straight line through a body or figure that satisfies certain conditions
ecuador magnético
an imaginary line paralleling the equator where a magnetic needle has no dip
línea agónica
an imaginary line connecting points on the Earth's surface where the magnetic declination is zero
isógona,
línea isogónica
an imaginary line connecting points on the Earth's surface where the magnetic declination is the same
límite forestal
line marking the upper limit of tree growth in mountains or northern latitudes
bajo
the line formed by the lower edge of a skirt or coat
horizonte
the line at which the sky and Earth appear to meet
visual
an imaginary straight line along which an observer looks
paralelo
an imaginary line around the Earth parallel to the equator
latitud lunar
an imaginary line around the moon parallel to its equator
cuadrante
a quarter of the circumference of a circle
línea de flotación
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
línea de fuerza
an imaginary line in a field of force; direction of the line at any point is the direction of the force at that point
ruta aérea
a designated route followed by airplanes in flying from one airport to another
ronda
a regular route for a sentry or policeman
línea equinoccial
the great circle on the celestial sphere midway between the celestial poles
eclíptica,
eclíptico
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
ecuador
an imaginary line around the Earth forming the great circle that is equidistant from the north and south poles
horitzó
the great circle on the celestial sphere whose plane passes through the sensible horizon and the center of the Earth
isobara
(meteorology)an isogram connecting points having equal barometric pressure at a given time
isoterma,
isotermo
(meteorology) an isogram connecting points having the same temperature at a given time
longitud,
meridiano
an imaginary great circle on the surface of the earth passing through the north and south poles at right angles to the equator
órbita
the (usually elliptical) path described by one celestial body in its revolution about another
los trópicos,
trópico
either of two parallels of latitude about 23.5 degrees to the 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
divisoria continental
the watershed of a continent (especially the watershed of North America formed by a series of mountain ridges extending from Alaska to Mexico)