When the Curves Line Up

Watching the Sun, Moon and Planets

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When the Curves Line Up

‘Hertzsprung-Russell Diagram’

The Hertzsprung-Russel Diagram is a chart to compare stellar properties. (Credit: European Space Agency)

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Copyright Statement

This web site is written and edited by Dr. Jeffrey L. Hunt. The photos and diagrams on the site are made by the author unless otherwise credited.

Raw data is from the U.S. Naval Observatory and Starry Night computer program.

Content

Content is derived from multiple astronomical sources, including the U.S. Naval Observatory, NASA, ESA, and various books, including Astronomical Tables of the Sun, Moon and Planets by Jean Meeus. Starry Night and Stellarium computer programs are used as well. Updates and corrections are made as required. Some articles are updated at the time of actual astronomical events with new photographs. The author strives for accurate information.

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