Though some theories will sound outlandish to modern readers (Anaximander thought that celestial bodies moved on giant wheels “filled with fire”), others are impressively forward-thinking ...

The term "conjunction" refers specifically to the alignment of planets within a few degrees of one another in the celestial sphere. These alignments are purely observational and depend on the ...

To understand how the “wobble” of the 26,000-year-precession cycle has no noticeable effect on the Sun’s rise and set points, imagine the celestial sphere of stars that surrounds us.

Image Represents One of the First-Ever Maps of the World Anaximander's map was said to have been made between 2,500 and 2,600 years ago.

NASA is funding a project at the University of Utah that brings real-time visualizations of satellites for use by researchers, planetariums and educators.

This nearly perfect "cosmic bubble" has made headlines around the world — here's what all the fuss is about.

Copernican armillary sphere from set of two armillary spheres and a celestial globe constructed in paper on pasteboard with metal fitments supported on a decorative mahogany baluster base. Shows ...