It's said he 1st saw a published copy of his "On the Revolutions of the Celestial Spheres" the day he died
Nicolas Copernicus - Crystalinks  He had written the preliminary manuscript description of his early version of the theory ... and its existence was only known indirectly until copies were published in the ... After his father's death, sometime between 1483 and 1485, his mother's ... The first provided a summary of the foundations of Ptolemy's astronomy, with...
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).