The Chinese first used compasses not for navigation, but for spiritual purposes. They used the magnetic devices to organize buildings and other things according to feng shui, the ancient practice of harmonizing an environment according to the "laws of Heaven."
condition of being exact or correct.
a modification of an organism or its parts that makes it more fit for existence. An adaptation is passed from generation to generation.
vehicle able to travel and operate above the ground.
the distance above sea level.
single axis or line around which a body rotates or spins.
to reach a conclusion by mathematical or logical methods.
one of the four main points of a compass: north, east, south, west.
something that is seen, heard, touched, smelled, or tasted without being studied in depth.
complex way of life that developed as humans began to develop urban settlements.
instrument used to tell direction.
freely rotating circular card with magnets attached to its underside, its face marked with up to 32 compass points, degrees clockwise from north, or both.
to be made of.
to work together or organize for a specific goal.
error of a magnetic compass due to the effect of local magnetism, such as materials used in the construction of a ship or aircraft.
tool or piece of machinery.
the way in which somebody or something goes, points, or faces.
difference or conflict in sets of data.
person who plans the building of things, such as structures (construction engineer) or substances (chemical engineer).
imaginary line around the Earth, another planet, or star running east-west, 0 degrees latitude.
to develop new characteristics based on adaptation and natural selection.
person who studies unknown areas.
stylized design, often associated with France or French royalty, representing three petals of a flowering iris encircled by a band.
bar of soft iron, mounted vertically beneath a magnetic compass to compensate for vertical magnetic currents.
system of satellites and receiving devices used to determine the location of something on Earth.
device that gets radio signals from satellites in orbit above Earth in order to calculate a precise location.
device consisting of a rotating wheel mounted so that its axis can turn freely in any direction, and capable of maintaining the same absolute direction in spite of movements of the mountings and surrounding parts.
to display or show.
chemical element with the symbol Fe.
one of two iron balls placed next to a magnetic compass to compensate for horizontal magnetic currents. Also called a Kelvin ball or navigator's ball.
a prominent feature that guides in navigation or marks a site.
the geographic features of a region.
language of ancient Rome and the Roman Empire.
distance north or south of the Equator, measured in degrees.
distance east or west of the prime meridian, measured in degrees.
material that has the ability to physically attract other substances.
difference between a local magentic field, or the direction a compass points, and true north, or the direction of the geographic North Pole.
area around and affected by a magnet or charged particle.
direction that all compass needles point.
to turn something into a magnet.
symbolic representation of selected characteristics of a place, usually drawn on a flat surface.
having to do with the ocean.
facility with instruments and tools for measuring and keeping track of conditions in an area.
art and science of determining an object's position, course, and distance traveled.
half of the Earth between the North Pole and the Equator.
to move in a circular pattern around a more massive object.
person who steers a ship or aircraft.
to form a path based on calculations.
able to be easily transported from one place to another.
rule or standard.
device for distributing light into different colors of the spectrum.
dependable or consistent.
to turn around a center point or axis.
object that orbits around something else. Satellites can be natural, like moons, or made by people.
important or impressive.
half of the Earth between the South Pole and the Equator.
metal made of the elements iron and carbon.
direction of the geographic North Pole.