StarDate Online

  • Moon, Venus, and Mars

    The crescent Moon perches quite low in the southwest at nightfall. Venus, the “evening star,” stands to the upper left of the Moon, with the fainter planet Mars to the upper left of Venus.

  • Orion’s Footstool

    Just northwest of Rigel, the bright blue-white star that marks the left leg of Orion, look for Cursa, “Orion’s footstool.” Cursa is the second-brightest star in Eridanus, the river. The star is in the southeast in mid-evening.

  • Birth of a Giant

    Betelgeuse, the second-brightest star of Orion, is one of the most impressive stars in the galaxy. It is many times bigger and heavier than the Sun, and tens of thousands of times brighter. It also has an impressive fate: it will explode as a supernova.

  • New Moon

    The Moon reaches its new phase at 12:53 a.m. CST tomorrow, when it crosses between Earth and Sun and is lost in the Sun’s glare. It will return to view in a couple of days as a thin crescent in the southwest in early evening.

  • Canopus

    Canopus, the second-brightest star in the night sky, is visible for a couple of hours after midnight from southern latitudes. It is below Sirius, the brightest star, and not far above the horizon.

  • Northern Cross

    The brightest star in the Northern Cross, which stands atop the northwestern horizon a couple of hours after sunset, is Deneb, which is at the top of the cross. At the bottom of the cross is Albireo, which is actually a pair of stars 400 light-years away.

  • Evening Sights

    Venus, the “evening star,” is low in the southwest at nightfall. Mars is to the upper left of Venus, shining pale orange. And the Summer Triangle perches to the right of the two planets, with its highest point marked by Deneb, the tail of Cygnus, the swan.

  • Christmas Skies

    Look in the southeast in mid-evening for dazzling Orion. Find its three-star belt, which aims straight up and down. It is flanked by the bright orange star Betelgeuse on the left, and the bright blue star Rigel on the right.

  • Spring Preview

    Winter is just starting, but you can already find a hint of spring in the pre-dawn sky. The stars and constellations that are in view a couple of hours before sunrise will be in view a couple of hours after sunset in late April.

  • Moon and Spica

    Spica, the leading light of Virgo, stands to the right of the Moon at first light tomorrow. The bright planet Jupiter is above Spica. The Spica system consists of two massive, brilliant stars in a very tight orbit.

  • Moon and Jupiter

    Three bright objects stair-step up the sky at first light tomorrow: the Moon, the planet Jupiter, and the star Spica. Jupiter looks like a brilliant star below the Moon, with fainter Spica below Jupiter.

  • Winter Solstice

    Winter starts at 4:44 a.m. CST tomorrow. That’s the time of the December solstice, when the Sun stands farthest south in the sky for the year. The solstice is the shortest day of the year in the northern hemisphere.

  • N Columba

    The constellation Columba, the dove, rises in the southeast in mid-evening and stands due south around midnight. Its name comes from the story of Jason and the Argonauts, although the dove sometimes is linked to the story of Noah’s Ark.

  • Barred Spirals

    The large constellation Eridanus, the river, flows across the south tonight. One of its treasures is the barred spiral galaxy NGC 1300. It contains a long, fat “bar” of stars in its middle, with spiral arms swirling off the ends of the bar.

  • Moon and Regulus

    Regulus, the heart of the lion, is close to the lower left of the Moon as they climb into view around 11 p.m. What we see as Regulus is a star that is big, bright, and heavy. But it has at least three companions that are too faint to see.

  • Galactic Matters

    Under dark skies, two galaxies are in view tonight: Andromeda and our own Milky Way. The Milky Way forms a faint band across the northern sky. Andromeda stands just above the apex of the Milky Way’s arch and looks like a small, hazy patch of light.

  • Lunar Impacts

    The Moon is scarred by billions of years of impacts. They blasted out big craters and punched holes that filled with molten rock that bubbled up from below. Many of those scars are visible to the eye as the dark features on the lunar disk.

  • Sun in Ophiuchus

    The Sun is passing through Ophiuchus, the serpent-bearer, the thirteenth constellation of the zodiac. Ancient astrologers did not include Ophiuchus on their early charts of the zodiac. The Sun is within its boundaries for more than two weeks.

  • Long-Night Moon

    The Moon is full tonight. December’s full Moon is known as the Moon Before Yule. It’s also known as the Long-Night Moon because it is in view longer than any other full Moon of the year. The moonlight will overpower the Geminid meteor shower.

  • Moon and Aldebaran

    Aldebaran, the star that marks the eye of Taurus the bull, is close to the lower left of the Moon at sunset. Not long afterward, the Moon will cross in front of the star, blocking it from view for up to about an hour.

  • Evening Mercury

    The planet Mercury is putting in a brief evening appearance. It is quite low in the southwest 30 to 45 minutes after sunset, far to the lower right of brilliant Venus. Mercury looks like a fairly bright star, but you may need binoculars to see it.

  • Capella

    Capella, one of the brightest stars in the night sky, is in the northeast at nightfall and soars high overhead later on. What we see as Capella is really two stars. Each star is bigger, brighter, and heavier than the Sun.

  • Vega

    Vega, one of the night sky’s brightest stars, is disappearing from evening view this month. Tonight, it sets around 9:30 or 10 p.m., but by month’s end it will set by about 8:30. Look for it in early evening, low in the northwest.

  • Fire and Water

    The ancient elements of fire and water sit side by side low in the southern sky at this time of year. Fire is represented by the constellation Fornax, the furnace. To its east is the watery constellation Eridanus, the river.

  • Sculptor

    The faint constellation Sculptor, the sculptor’s workshop, passes across the south and southwest on December evenings. It was one of 14 constellations created in the 1750s by French astronomer Nicolas Louis de la Caille.

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