I calculate the earth is about 566 million £1 coins wide so everything scales down by roughly that much. So the sun would be 0.164 miles away.. and Proxima Centauri 44,063 miles away?
Googling "coin size":
Coin radius: 38.1 mm - silver dollar (Cited from: <a href="https://www.cointalk.com/threads/us-coin-relative-sizes-chart.232753/" rel="nofollow">https://www.cointalk.com/threads/us-coin-relative-sizes-char...</a>)<p>Googling "earth size":
Earth radius: 6371 km<p>Googling "distance to sun in km"
Distance to Sun: 149.6 million km<p>38.1e-4 / x = 6371e4 / 149.6e10<p>Doing the calculation is left as an exercise to the reader.