What historical factor likely solidified the 'average' label for the Sun early in astronomical study?

Answer

Early comparisons were biased toward easily observable, brighter stars like O, B, A, and F types.

Observational selection bias led early astronomers to compare the Sun primarily to the brighter, larger, and rarer stars that were easily visible, where the Sun's luminosity and size appeared more moderate.

What historical factor likely solidified the 'average' label for the Sun early in astronomical study?
sunastronomystar