The Smithsonian Solar Eclipse Expedition

The Smithsonian Astrophysical Observatory Solar Constant Program

The Astrophysical Observatory of the Smithsonian Institution (APO) made measurements of the solar constant at many locations on the earth's surface from 1902 to 1962. These measurements have been interpreted by various authors to show that the sun has both a long-term secular change in brightness and cyclic variations. The same data set has been used by other authors to show that the sun is con...

Solar eclipse safety.

Solar radiation during a total solar eclipse

The solar eclipse: a natural meteorological experiment

A solar eclipse provides a well-characterized reduction in solar radiation, of calculable amount and duration. This captivating natural astronomical phenomenon is ideally suited to science outreach activities, but the predictability of the change in solar radiation also provides unusual conditions for assessing the atmospheric response to a known stimulus. Modern automatic observing networks us...

Solar eclipse-burn of macula.

THE following case is of interest in view of its association with the recent partial eclipse of the sun. 2695379, Guardsman W.S.S., 1st Btn. Scots Guards, aged 27 years, came to see me on July 12, 1945, complaining of obscured vision in the left eye. ;History.-No family history. Five years ago he was in Mersa Matruh for a year. During this time he was working in an outdoor-cookhouse. ToWards th...