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long. abbreviation of "longitude," the angular distance on the earth's surface east or west of the prime meridian at Greenwich, England, measured either in degrees or in hours, minutes, and seconds.
longitudinal of or relating to longitude or length. [1/4 definitions]
prime meridian the meridian passing through Greenwich, England, used as a starting line for the measurement of longitude east and west.
right ascension the angular distance of the arc of one of the hour circles of a celestial body, measured eastward along the equator from the vernal equinox to the intersection of the hour circle, and expressed in degrees or hours; the celestial equivalent of longitude.
sinusoidal projection an equal-area map projection of the entire earth in which all lines of latitude are shown as straight lines and all lines of longitude as curved.