This website, containing information from the Sloan Digital Sky Survey, provides students with the opportunity to make a H-R Diagram for different star systems. It goes through the relation between the color of a star and its surface temperature, in order to obtain a preliminary diagram. Then, using data from the Hipparcos probe, and the Pleiades system, the student is able to calculate the distance to several stars, which leads to the final version of the Diagram. The same concept is applied to Globular Clusters, and the student is able to tell the age of it by looking at its color
<a href="http://www.compadre.org/astronomy/items/detail.cfm?ID=4873">Sloan Digital Sky Survey. Sloan Digital Sky Survey: The Hertzsprung-Russell Diagram. Seattle: Sloan Digital Sky Survey, February 15, 2007.</a>
Sloan Digital Sky Survey. Sloan Digital Sky Survey: The Hertzsprung-Russell Diagram. Seattle: Sloan Digital Sky Survey, February 15, 2007. http://cas.sdss.org/dr5/en/proj/advanced/hr/ (accessed 25 June 2017).
%0 Electronic Source %D February 15, 2007 %T Sloan Digital Sky Survey: The Hertzsprung-Russell Diagram %I Sloan Digital Sky Survey %V 2017 %N 25 June 2017 %8 February 15, 2007 %9 text/html %U http://cas.sdss.org/dr5/en/proj/advanced/hr/
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