It represents the distance that light travels in one Julian year in a vacuum. There is a constant, the unit distance, of the value of one astronomical unit. In astronomy, because of the great distances under consideration, additional units are used for convenience.Īn astronomical unit (AU, au, a.u., or ua) equals 149,597,870,700 meters. One knot equals the speed of one nautical mile per hour. When calculating speed using nautical miles, often knots are used as units. This allowed for simplified calculations of latitude because every 60 nautical miles were one degree of latitude. Historically it was defined as one minute of arc along the meridian or 1/(60×180) of a meridian. The clearance below the bridge is 220 ft or 67.1 m at tide Distances in Navigation Nanometer (1×10⁻⁹ of a meter), picometer (1×10⁻¹² of a meter), femtometer (1×10⁻¹⁵ of a meter), and attometer (1×10⁻¹⁸ of a meter) are also used. It is also known as micron and is represented by the sign µ. It is commonly used in biology to measure microorganisms, as well as for measuring infrared radiation wavelengths. Sciences like Biology and Physics work with very small distances, therefore additional units are used. Units such as inch, foot, and mile are used where the metric system is not accepted, such as in the USA and the UK.
Derivatives of the meter, such as kilometers and centimeters, are also used in the metric system. The basic unit for length and distance in the International System of Units (SI) is a meter.
For three-dimensional objects, it is usually measured horizontally.ĭistance, on the other hand, refers to the measure of how far the objects are from each other. Length describes the longest dimension of an object. Its total length is about 1.7 mi or 2.7 km. Refer to the Common Unit Systems page for further information.The Golden Gate Bridge spanning the Golden Gate, the strait that provides an opening between the San Francisco Bay and the Pacific Ocean.
The intent of this site is to provide a convenient means to convert between the various units of measurement within different systems, as well as to provide a basic understanding of the systems currently in use, and how they interact. Although SI is intended for global use, it has not been fully adopted, and some other systems of measurement are still used in parts of the world. Currently, the global standard of measurement is the International System of Units (SI), which is a modern form of the metric system. In human history, various unit systems were developed and used in different regions and cultures. Other quantities can be expressed as a multiple of the unit. Unit Converters - Full Versions Common ConvertersĪ unit is a measurement of a quantity that is defined or adopted by tradition or law.
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