During the total solar eclipse of Aug. 18, 1868, two astronomers, Pierre Jules César Janssen of France and J. Norman Lockyer ...

One of the last few Titan shadow transits of the year takes place overnight tonight, with several of Saturn’s other moons ...

Today in the history of astronomy, the second moon of Mars is discovered.

NGC 6910 is a bright open cluster in Cygnus the Swan, visible overnight as the Summer Triangle flies high around local ...

Today in the history of astronomy, a photo is shot. The moon Phoebe will be discovered in it months later.

The Last Quarter Moon floats in the predawn sky, preparing to occult the Pleiades from some parts of the world.

Space launch deregulation begins as President Trump signs order to relax FAA licensing and amend Part 450 rule to accelerate ...

The sidereal day is defined to be the length of time for the March equinox to return to your celestial meridian. Compare this ...

The waning Moon passes Jupiter, Venus, and Mercury before dawn, while Titan’s shadow transits Saturn in the sky this week.

The largest body in the main belt comes to a brief standstill in the sky, visible before sunrise in Cetus the Whale.