Convert Lightyears to Yards (ly to yd) ▶
How to convert
1 yard (yd) = 9.66542E-17 lightyear (ly). Yard (yd) is a unit of Length used in Standard system. Lightyear (ly) is a unit of Length used in Metric system.
Yard: A Unit of Length
A yard is a unit of length that is equal to 3 feet or 36 inches in the imperial and U.S. customary systems of measurement. It is also equal to 0.9144 meter in the International System of Units (SI). A distance of 1,760 yards is equal to 1 mile. The symbol for yard is yd.
How to Convert Yard
To convert a yard to other units of length, you can use the following formulas:
Where Yard is Used
The yard is mainly used in the United States, the United Kingdom and some other countries that have historical ties with them. It is used for measuring length, distance, area and volume in various contexts such as:
Definition of the Yard
The current definition of the yard was established by an international agreement in 1959 as exactly 0.9144 meter. This definition was based on a prototype bronze bar that was forged in 1855 as an exact copy of the British Imperial Standard Yard held by Parliament. The prototype bar was called Bronze Yard No.11 and was the official standard of length for the United States until 1892.
The yard is defined as the length of the path travelled by light in vacuum during a time interval of
(1/299792458) × (3600/3937)seconds. This means that one yard is equal to 3600/3937 light seconds.
History of the Yard
The origin of the yard measure is uncertain. It may have derived from the old English unit of tax assessment called the yardland, which was equal to 1/4 hide or about 30 acres. It may also have derived from the old English unit of surveying called the rod, which was equal to 1/4 chain or about 16 (1/2) feet.
The word “yard” comes from the old English word “gerd” or “gyrd”, which meant a branch, a staff or a measuring rod. The word “yard” was first used to describe this length in William Langland’s poem Piers Plowman in the late 14th century.
The first official standard for the yard was established by King Henry I of England in the early 12th century. He ordered that the yard should be equal to the length of his arm from the tip of his nose to the end of his thumb.
The yard was also used in other countries, such as Scotland, Ireland, France and Spain, with slight variations in length. For example, the Scottish yard was equal to 37 inches, the Irish yard was equal to 40 inches, the French yard was equal to 39.37 inches and the Spanish yard was equal to 32.38 inches.
The yard underwent several changes and refinements over the centuries, until it was finally standardized as 0.9144 meter in 1959 by an international agreement between the United States, the United Kingdom, Canada, Australia, New Zealand and South Africa.
Example Conversions of Yard to Other Units
Here are some example conversions of yard to other units of length:
Lightyear: A Unit of Length
The lightyear is a large unit of length used to express astronomical distances and is equivalent to about 9.46 trillion kilometers (9.46 × 10^12 km), or 5.88 trillion miles (5.88 × 10^12 mi). As defined by the International Astronomical Union (IAU), a lightyear is the distance that light travels in a vacuum in one Julian year (365.25 days). The lightyear is most often used when expressing distances to stars and other distances on a galactic scale, especially in non-specialist contexts and popular science publications.
In this article, we will explore the definition, history, usage and conversion of the lightyear as a unit of length.
Definition of the Lightyear
The lightyear is a unit of length that is equal to the product of the Julian year and the speed of light. The Julian year is a unit of time that is equal to 365.25 days or 31,557,600 seconds. The speed of light is a physical constant that is defined as 299,792,458 meters per second. The symbol for lightyear is ly.
The definition of the lightyear can be derived from the following formula:
1 ly = 1 Julian year × speed of light
1 ly = 31,557,600 s × 299,792,458 m/s
1 ly = 9,460,730,472,580,800 m
1 ly = 9.46 × 10^15 m
History of the Lightyear
The concept of the lightyear as a unit of distance was first proposed by the German astronomer Friedrich Wilhelm Bessel in 1838. He used it to estimate the distance to some nearby stars based on their parallax measurements. Parallax is the apparent shift in position of an object when viewed from different angles. Bessel calculated that the star 61 Cygni was about 10.3 lightyears away from Earth.
The term lightyear was popularized by the British astronomer James Bradley in his book Stellar Movements and the Structure of the Universe (1918). He used it to describe the distances to various stars and galaxies. He also introduced the term parsec as another unit of distance based on parallax.
The lightyear was officially recognized by the IAU in 1976 as part of its System of Astronomical Constants.
Usage of the Lightyear
The lightyear is a unit of length that is used for measuring astronomical distances that are too large to be expressed in other units such as kilometers or astronomical units (AU). An AU is equal to about 150 million kilometers or 93 million miles and is roughly the distance from Earth to the Sun.
The lightyear is commonly used in astronomy and cosmology to describe the distances to stars, galaxies, nebulae and other celestial objects. For example:
The lightyear can also be used to measure time intervals in cosmology by relating them to distances traveled by light. For example:
Example Conversions of Lightyear to Other Units
The lightyear can be converted to other units of length by using different factors and formulas. Here are some examples of conversion for different types of units:
1 ly × 9.46 × 10^12 = 9.46 × 10^12 km
1 ly × 5.88 × 10^12 = 5.88 × 10^12 mi
1 ly × 63,241 = 63,241 AU
1 ly / 3.26 = 0.31 pc
1 km / 9.46 × 10^12 = 1.06 × 10^-13 ly
1 mi / 5.88 × 10^12 = 1.70 × 10^-13 ly
1 AU / 63,241 = 1.58 × 10^-5 ly
1 pc × 3.26 = 3.26 ly
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