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Recognised as Physical constant

Light-year

  • ly
  • Exact by definition
  • astronomical

Light-year (ly) is 9.46073047 × 10^15 m. Exact, because it is c multiplied by a Julian year of exactly 365.25 days. Values follow CODATA 2018 (2019 SI redefinition).

Value

Value9.46073047 × 10^15 m
Scientific notation9.46073047258 × 10^15 m
Unitm
Symbolly
ExactnessExact by definitionExact, because it is c multiplied by a Julian year of exactly 365.25 days.
Reciprocal1.057000834 × 10^-16
Order of magnitude10^15

Multiples

× 21.89214609 × 10^16
× 109.46073047 × 10^16
× 1009.46073047 × 10^17
× 1,0009.46073047 × 10^18
× 0.54.73036524 × 10^15
× 0.19.46073047 × 10^14

Provenance

DatasetCODATA 2018 (2019 SI redefinition)
Categoryastronomical
Why it mattersExact, because it is c multiplied by a Julian year of exactly 365.25 days.

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