Compass: Difference between revisions
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A '''compass''' (or '''mariner's compass''') is a navigational instrument for finding directions on the earth. It consists of a magnetized pointer free to align itself accurately with [[Earth's magnetic field|Earth]]'s [[magnetic field]], which is of great assistance in [[navigation]]. The [[cardinal points]] are [[north]], [[south]], east and west. A compass can be used in conjunction with a [[chronometer]] and a [[sextant]] to provide a very accurate [[navigation]] capability. This device greatly improved maritime trade by making travel safer and more efficient. An early form of compass was invented in China in the 11th century. The familiar mariner's compass was invented in Europe around 1300. | A '''compass''' (or '''mariner's compass''') is a navigational instrument for finding directions on the earth. It consists of a magnetized pointer free to align itself accurately with [[Earth's magnetic field|Earth]]'s [[magnetic field]], which is of great assistance in [[navigation]]. The [[cardinal points]] are [[north]], [[south]], east and west. A compass can be used in conjunction with a [[chronometer]] and a [[sextant]] to provide a very accurate [[navigation]] capability. This device greatly improved maritime trade by making travel safer and more efficient. An early form of compass was invented in China in the 11th century. The familiar mariner's compass was invented in Europe around 1300. | ||
More technically, a ''compass'' is a magnetic device using a needle to indicate the direction of the magnetic north of a planet's [[magnetosphere]]. Any [[Measuring instrument|instrument]] with a magnetized bar or needle turning freely upon a pivot and pointing in a [[north]]erly and [[south]]erly direction can be considered a compass. A '''compass dial''' is a small pocket compass with a [[sundial]]. A '''variation compass''' is a specific instrument of a delicate type of construction. It is used by observing variations of the needle. A [[gyrocompass]] or | More technically, a ''compass'' is a magnetic device using a needle to indicate the direction of the magnetic north of a planet's [[magnetosphere]]. Any [[Measuring instrument|instrument]] with a magnetized bar or needle turning freely upon a pivot and pointing in a [[north]]erly and [[south]]erly direction can be considered a compass. A '''compass dial''' is a small pocket compass with a [[sundial]]. A '''variation compass''' is a specific instrument of a delicate type of construction. It is used by observing variations of the needle. A [[gyrocompass]] or astrocompass can also be used to ascertain [[True north]]. | ||
== History of the navigational compass == | == History of the navigational compass == | ||