Astronomy: An all-American eclipse

American Astronomical Society – Division on Dynamical Astronomy

Currently, there are more than 100 confirmed multiple-planet systems. Moreover, a recent study by Kepler has identified 361 multiple-planet candidate systems. Investigating these systems would give us an important clue in understanding formation and evolution of planetary systems. In such multiple-planet systems, secular interactions among planets could play a significant role in determining th...

American Astronomical Society Division on Dynamical Astronomy

[1.01] Asteroids: Radar Observations and Dynamics S. J. Ostro (JPL/Caltech) Radar delay-Doppler measurements are powerful for refining asteroid orbits because they have extremely fine fractional precision and are orthogonal to optical angle astrometry. Radar detection of a newly discovered near-Earth asteroid (NEA) secures its orbit and can add centuries to the interval over which its close Ear...

An Eclipse before Sunset

Astronomy during the Early Years of the American Philosophical Society.

Astronomy During the Early Years of the American Reports: Philosophical Society: DR. S. A. MITCHELL .................. 489 First Report of the War Policy Committee of the American Institute of Physics .......... .............. 508 Obituary: Special Articles: Arthur Newell Talbot: PROFESSOR F. E. RICHART. The Biochemical Specificity of Sulfanilamide and Recent Deaths ......... 495 of Other Antib...

An Evaluation of Plasma Astronomy

Many recent creationists are attracted to plasma astronomy, the idea that electromagnetic effects rather than gravity are responsible for much of the structure of the universe. I examine the claims of at least one proponent of plasma astronomy, Donald E. Scott. Scott has written a book that discusses many aspects of plasma astronomy. This book appears to be the most concise treatment of plasma ...