The Àryabhatíya of Àryabhata
The oldest exact astronomic constant? The ratio of earth rotations to lunar orbits in Aryabhata's AD 498 writing.
www.jqjacobs.net Details

This Month in the History of Astronomy
Short descriptions of important discoveries, events, and birthdays sorted by month.
astro.martianbachelor.com Details

Tycho's Star Maps
Celestial atlases and globes on exhibit at the Royal Observatory, Greenwich.
www.nmm.ac.uk Details

Understanding Tidal Friction
Article by Peter Brosche on gaining understanding of changes in the Moon's orbit.
www.tribunes.com Details

X-ray Astronomy at Goddard
Describes observations using balloons, rockets and satellites.
lhea.gsfc.nasa.gov Details