McKim Observatory still houses many of its original instruments, including a 9.53 inch Clark Refractor telescope, a meridian transit telescope, and a gravity driven chronograph. Missing from the early ...

On June 5th in North and Central America, and June 6th in Asia, Australia, and most of Europe, the planet Venus will cross in front of the Sun. This will be only the eighth such transit of Venus since ...

McKim Observatory is an excellent example of a late 19th-century American observatory. Built in 1884, it retains much of its original equipment and remains largely untouched by modernization. Its ...

September’s sky is rich with opportunities. Titan’s shadow continues to transit Saturn. The ringed planet reaches opposition along with Neptune, with both worlds in the same region of the sky. Mars is ...

Looking for a sky event this week? Check out our full Sky This Week column. February 3: Uranus stands still Io and its shadow ...

This month, the U.S. Naval Observatory’s Flagstaff Station will celebrate the 50th anniversary of its establishment as the USNO’s dark-sky observing site. This milestone will be marked by a public ...