The twinkling effect is caused by the unstable state of the air through which a star's light must pass ... To get your best view of the "Sirius show," you should find a location that will afford ...

Some people probably believe that the twinkling effect is produced by the stars themselves, but that is not the case at all.

Arcturus (at a magnitude of -0.05), one of the few stars mentioned by name in the Bible, is a giant, about 25 times the diameter of our sun and 36.7 light years away. Boötes is chasing the Bears with ...

The quirks of light moving through gas are the cause of stellar twinkling, which can be a bane—and sometimes a boon—for astronomers ...

From meteor showers to constellations, here's everything you need to know about observing the summer sky using the unaided ...

Did you know that the sun is up for more hours this month than in August? August is summertime, and May is still spring, so it may not seem quite right.

Two days later, the just-past-full moon will occult the star Antares. Moons are full when they are on the opposite side of Earth from the sun, and fully illuminated (from the point of view of Earth).

Either the telescope ... Sirius—as that wonderful aid to physical astronomy, the spectroscope, reveals—is shooting through space at the rate of a thousand million miles a year. The star ...

The Full or Flower Moon is on May 12. The Moon is Last Quarter, rising at midnight, on May 20. On the 22nd, the waning ...