Points of View: Shadows, Photons, Planets, and Life

Details Points of View: Shadows, Photons, Planets, and Life Points of View: Shadows, Photons, Planets, and Life

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005assl..334....3s&link_type=abstract

The new astronomy: opening the electromagnetic window and expanding our view of planet earth: a meeting to honor Woody Sullivan

Astronomy and Astrophysics

Astrophysics

Scientific paper

I combine here a potpourri of topics that have been of keen interest over my career. The first is gnomonics, the art and science of sundials: at its heart are the shadows that elegantly chart the motions of the Sun on a defined surface. More broadly, shadows have been amazingly productive in astronomy through the centuries. Examples range from the ancient Greeks (the distances of Moon and Sun) to the Scientific Revolution (Roemer's determination of the speed of light). They also include twentieth century science (solar eclipse observations relative to general relativity) and current twenty-first century research (transits of extrasolar planets).

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