# The parsec and the light-year are both units of?

May 15, 2016

Distance. 1 light year = $1.5772524 X {10}^{16}$ meters, nearly.

1 parsec = $3.0856775 X {10}^{16}$ meters = 1.95636253 light years.

#### Explanation:

The distance that light traverses in 1 sec is light second = 499792458 meters.

1 light year = this distance for 1 year

= 499792458 X(the number of seconds in a year)

= 499792458 X (60 X 60 X 24 X 365.256363) meters

= $1.5772524 X {10}^{16}$ meters

1 parsec = $3.0856776 X {10}^{16}$ meters = 1.9563625 light years.

Definition of 1 parsec

= (Sun-Earth distance)/( 1'' in radian measure)

$= 1 A U X \left(3600 X \frac{180}{\pi}\right)$

$= 149597870700 m e t e r s X 2.062648062 X {10}^{5}$

$= 3.0856776 X {10}^{16}$ meters

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