For Kitt Peak we also have both 1988 and 1999 observations at modestly large zenith distances ... end{document} ). In the directions away from Tucson, the sky has brightened by ≈0.35 mag arcsec−2 over ...

Tucson's new ‘Astro Trail' is a collection of national parks, state parks, observatories, and planetariums, that offer a ...

TUCSON, Ariz. (13 News)—Kitt Peak National Observatory will celebrate 60 years of public tours on September 27, after a ...