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 ...

In a universe renowned for its chaotic and irregular structures, the recent discovery of an almost perfectly sphere like object has left astronomers both intrigued and puzzled. Named Teleios ...

Earth's coordinates and the Celestial Sphere I’m dusting off the plastic tub where I keep all the materials for my Celestial Navigation class, in preparation for teaching it again, starting March 4.

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 ...