Practical units

Some Important Practical Units

For Length/Distance (I) Astronomical Unit It is the mean distance of the earth from the sun. 1 AU = 1.496×10¹¹ m (II) Light Year It is the distance travelled by light in vacuum in 1 year. 1 ly = 9.46×10¹⁵ m (III) Parallactic Second It is the distance at which an arc of length 1 […]

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