Star Night at the LTO, December 17
Learn about two exciting NASA Discovery Program missions encountering comets, two of which are arriving at their spectacular destinations this winter!
EarthSky Tonight—Oct. 29, Last quarter moon marks direction of Earth’s orbital motion
The terminator – the shadow line dividing the lunar day from the lunar night – shows you where it’s sunset on the waning moon.
EarthSky Tonight—Sept. 30, What bright star flashes red and green in northeast?
The atmosphere splits or “refracts” the star’s light, just as a prism splits sunlight.
EarthSky Tonight—September 22, Harvest moon, Jupiter, Autumn equinox
The equinox falls at 9:09 p.m. on this Wednesday evening, according to clocks set to Mountain Daylight Time. That translates to 3:09 a.m. tomorrow – on Thursday, September 23 –…
EarthSky Tonight—September 17, Close-up on constellation Perseus the Hero and Demon Star
Thus, Algol is what has been called an “eclipsing variable star.”
EarthSky Tonight—Sept 16, Cassiopeia and Perseus in northeast on September evenings
Perseus (the Hero) follows Cassiopeia across the night sky.