# NavList:

## A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

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Re: Arcturus- what is the arc diameter from Earth?
From: Gary LaPook
Date: 2015 Aug 7, 02:16 +0000
0.00650 inches, about 6 one-thousandths of an inch.

((1.767 x 10^7  km x 2) / 3.472 x 10^14  km ) x 5280 feet per mile X 12  inches per foot = 0.00650 inches.

gl

To: garylapook---.net
Sent: Thursday, August 6, 2015 1:51 PM
Subject: [NavList] Re: Arcturus- what is the arc diameter from Earth?

Peter,
Using your math skill can you give me a scale example of that size? That is, for example; "if Arcturus were 1 mile away it would appear to be 1/16" of an inch in diameter".
What do you think?
Thanks,

Sam

Arcturus is 36.7 light years (3.472 x 10^14 kilometers) from Earth and has a radius of 1.767 x 10^7 kilometers, which I work out to be a semidiameter of 0.013".

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