To confirm these calculations are now correct.
Using the 5c scale the Sun Earth distance is around 2 metres.
Two metres is now our new AU.
In terms of AUs the distance of Proxima Centauri from the Sun is:
(554X1000)/2=
277,000 AU.
According to NASA
Quote:
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Proxima Centauri, the closest star to our own, is still 39,900,000,000,000 km away. (Or 271,000 AU.) When we talk about the distances to the stars, we no longer use the AU, or Astronomical Unit; commonly, the light year is used. A light year is the distance light travels in one year - it is equal to 9.46 x 1012 km. Alpha Centauri A & B are roughly 4.35 light years away from us. Proxima Centauri is slightly closer at 4.22 light years.
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So the calculation is fairly accurate.
Regards
Steven