The color of the cross on the flag of Switzerland
Flag of Switzerland - Wikipedia  Rectangular flag with a white cross in the center with background in red. The flag of Switzerland consists of a red flag with a white cross (a bold, equilateral cross) in the centre. It is one of only two square sovereign-state flags, the other being the flag of Vatican City.
Hertzsprung Russell Diagram - Teach Astronomy  Hertzsprung-Russell diagram showing color and size of stars. ... that exist, their first step was to devise a sensible way to arrange and study the data to find ... astronomer Ejnar Hertzsprung and the American astronomer Henry Norris Russell ... The Sun is near the middle of the diagram (one solar luminosity, spectral type G).