Datum Plane

Science / Geology / Datum Plane: An artificially established, well surveyed horizontal plane against which elevations, depths, tides, etc. are measured (for example mean sea-level).
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Other Words for Plane

Plane Verb Synonyms: flat or level (surface)
Plane Noun Synonyms: flat, even, level, smooth, plain, regular, unbroken, uninterrupted, uniform, horizontal

North American Vertical Datum

Science / Tides and Currents / North American Vertical Datum: A fixed reference for elevations determined by geodetic leveling. The datum was derived from a general adjustment of the first-order terrestrial leveling nets of the United States, Canada, and Mexico. MORE

Nodal Plane

Entertainment / Photography / Nodal Plane: Is an imaginary line passing through the nodal point, perpendicular to the optical axis. MORE


Entertainment / Golf / Plane: (also 'swing plane') most easily visualized as the plane that the shaft of the club or the clubhead's arc describes during the swing MORE


Science / Astrology / Planet: From the Greek planetes, wanderer; used astrologically to describe any heavenly body which when viewed from Earth appears to move, as distinguished from fixed stars. MORE

Planetary Hours

Science / Astrology / Planetary Hours: A system devised by ancient astrologers that assigned one of the seven planets then known to each hour of the day. The first hour of sunrise was ruled by the planetary day ruler (Sunday, Sun; Monday, MORE

Planetary Gear

Technology / Motorcycle / Planetary Gear: A gear system that consists of one or more outer gears (or planet gears), rotating about a central gear (or sun gear). Planet gears are often mounted on a movable arm or carrier which also may rotate MORE