Anyway, using the definition of the parsec (648000/pi AU) and the speed of light from Allen’s Astrophysical Constants (4th edition) , I get 1191.2948 days, verifying Terry’s calculation.

Translating to light years is problematical since there are several definitions of the year (sidereal, Julian, tropical, anomalistic, etc.), each with a corresponding light year.

]]>BTW, @Crux, distance is proportional to time, the proportionality factor being the speed of light. The time it takes for light to travel 1 parsec is 1,191 days, as Terry said. (Disclaimer: I haven’t actually checked the math, but it sounds right.)

]]>I’d like to thank the flying spaghetti monster, my family, and the wonderful crew behind the IYA 365 days of astronomy podcast – without whom none of this would have been possible.

Thank you all so much!

…I guess my trophy is coming in the mail then?

]]>BTW, Kestrels don’t run, they fly! ;^)

]]>1 Parsec = 3.26163626 light years, i.e. 1,191 days.

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