LUNAR TOTAL ECLIPSE OF DECEMBER 27–28, 1917, AT HONOLULU

Variations in the sky brightness during a lunar eclipse

A total lunar eclipse is conjectured to have influence on the physical conditions of an environmental area, particularly on the brightness of the sky. The phenomenon might also be relevant on weather parameters change on Earth, such as temperature, humidity and pressure, though a straightforward correlation is not easy to establish. This work mainly aims at measuring the brightness of the sky a...

20 May 2001 − − 1917 Frederick Gerard Friedlander . 25 December

Lunar eclipse observations reveal anomalous thermal performance of Apollo reflectors

Laser ranging measurements during the total lunar eclipse on 2010 December 21 verify previously suspected thermal lensing in the retroreflectors left on the lunar surface by the Apollo astronauts. Signal levels during the eclipse far exceeded those historically seen at full moon, and varied over an order of magnitude as the eclipse progressed. These variations can be understood via a straightfo...

Total eclipse in the heart

For this new section, authors are invited to submit images of cardiovascular conditions that can be of value to our readers because the images are interesting, intriguing, rare and illustrative, thought-provoking, relevant to recent discussions or guidelines, entertaining, or all of the above. We do require them to be educational and/or of scientific interest. Except ECGs, which are captured in...

Solar radiation during a total solar eclipse