Well I looked into it some right now and dont see whta it's suppossed to prove.

"Contemplation of the diagram led astronomers to speculate that it might demonstrate stellar evolution"
Might

"In the 1930's and 1940's, with a understanding of hydrogen fusion, came a physically-based theory of evolution to red giants, and white dwarfs. By this time, study of the Hertzsprung-Russell diagram did not drive such developments but merely allowed stellar evolution to be presented graphically."
Yes

So what does this prove ?

From what I understood it lets scientists calculate the distance of the star to earth , shows the temperature , magnitude and luminosity of the stars. What does this prove ?

I will look for more information on it tomorrow , but from what I saw right now , it doesnt really show any support for the big bang.

But in turn fastlane , see the movies in the links I posted a couple of days ago , I know you didnt see them , so check them out.