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Posts Tagged ‘Gemini’

5/15/2018 – Ephemeris – Two thirds thru spring

May 15, 2018 Comments off

Ephemeris for Tuesday, May 15th. Today the Sun will be up for 14 hours and 49 minutes, setting at 9:04, and it will rise tomorrow at 6:13. The Moon is new today, and won’t be visible.

Here we are at the middle of May, nearly two-thirds through spring and in the west only a few winter stars remain. Castor and Pollux of Gemini are horizontal in the west, Procyon the Little Dog Star is below and left of them, Capella in Auriga is in the northwest, but for most of the IPR listening area it will never quite set. At 10:30 Betelgeuse in Orion the hunter will be setting, chased from the skies by Scorpius the scorpion, which is rising in the southeast. In one story it is the sting of this scorpion that killed him. Already at that time two-thirds of the stars of the summer Triangle are up. Bright Vega in Lyra the harp, and Deneb in Cygnus the swan. The Big Dipper reigns overhead as spring is in full bloom.

The times given are for the Traverse City/Interlochen area of Michigan. They may be different for your location.

Addendum

Goodbye winter, hello summer

The sky dome for 10:30 p.m. May 15, 2018 showing the stars and constellations. It may not work for any latitude or time, but it works for our location, near 45 degrees north. Created using Stellarium.

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03/09/2018 – Ephemeris – The good ship Argo

March 9, 2018 Comments off

Ephemeris for Friday, March 9th. The Sun will rise at 7:06. It’ll be up for 11 hours and 35 minutes, setting at 6:41. The Moon, at last quarter today, will rise at 2:50 tomorrow morning.

Located south and east of Canis Major, the great hunting dog of Orion and it brilliant star Sirius in the south is a dim constellation of Puppis, the poop deck of the old constellation Argo Navis, the constellation that depicts the ship Jason and the Argonauts used in their search for the Golden Fleece. This huge constellation has been subdivided. Only Puppis and Pyxis the ship’s compass are visible from Michigan. The other parts of the ship are Carina the keel, and Vela the sails require traveling south at least to the southern most of the United States. Three other constellations also related to this expedition are Gemini with Castor, who died on the expedition and Pollux. Hercules was also aboard as was the physician of the constellation Ophiuchus.

The times given are for the Traverse City/Interlochen area of Michigan. They may be different for your location.

Addendum

Argo Navis

Puppis ans Pyxis; what we can see from Michigan, plus the rest of Argo Navis at 9 p.m., March 9, 2018. The Stellarium artist has the ship reversed. Puppis is the rear end, not the bow. Note that the Crux, the Southern Cross is below the ship. Click on the image to enlarge. Created using Stellarium and GIMP.

01/12/2018 – Ephemeris – A look at Gemini the very unusual twins

January 12, 2018 1 comment

Ephemeris for Friday, January 12th. The Sun will rise at 8:18. It’ll be up for 9 hours and 6 minutes, setting at 5:24. The Moon, half way from last quarter to new, will rise at 5:16 tomorrow morning.

The constellation Gemini, the Twins is visible half way up the sky in the east at 9 p.m. The namesake stars of the two lads will be on the upper left edge of the constellation, nearly vertically aligned. Castor is above, while Pollux, a slightly brighter star is below it. Lines of stars from Castor and Pollux to the right delineate the lads. In Greek mythology Castor and Pollux were twins, and half brothers, Castor was fathered by a mere mortal, while Pollux was fathered by Zeus in the famous Leda and the swan affair. The brothers, however were inseparable, and when Castor was killed during the quest for the Golden Fleece, Pollux pleaded with Zeus to let him die also. Zeus granted his wish, so they both appear in the sky together forever.

The times given are for the Traverse City/Interlochen area of Michigan. They may be different for your location.

Addendum

Gemini

Gemini as it should appear at 9 p.m., January 12, 2018. Created using Stellarium.

Gemini with Castor and Pollux

Gemini with Castor and Pollux. A closeup with a different way to link the stars with constellation art.  Created with Stellarium.

02/16/2017 – Ephemeris – The Winter Circle

February 16, 2017 Comments off

Ephemeris for Thursday, February 16th.  The Sun will rise at 7:40.  It’ll be up for 10 hours and 32 minutes, setting at 6:12.  The Moon, 2 days before last quarter, will rise at 12:17 tomorrow morning.

The winter skies are blessed with more first magnitude stars than any other season.  These are the twenty-one brightest stars in the sky.  Six of these stars lie in a large circle centered on the seventh.  This circle is up all evening now that we are in the heart of winter.  Starting high overhead is Capella in Auriga the charioteer.  Moving clockwise, we come to Aldebaran in the face of Taurus the Bull.  Then down to Orion’s knee we find Rigel.  Down and left is the brightest star of all Sirius the Dog Star in Canis Major Orion’s large hunting dog, lowest of these stars in the south.  Moving up and left there is Procyon in Canis Minor, Then above it is Pollux in Gemini the twins.  All are centered on Betelgeuse in Orion.

Times are for the Traverse City/Interlochen area of Michigan. They may be different for your location.

Addendum

The Winter Circle of 1st magnitude stars

The Winter Circle of 1st magnitude stars. Created using my LookingUp program.

04/04/2016 – Ephemeris – Hydra the water snake will slither along the southern horizon this spring

April 4, 2016 Comments off

Ephemeris for Monday, April 4th.  The Sun will rise at 7:17.  It’ll be up for 12 hours and 57 minutes, setting at 8:14.   The Moon, 3 days before new, will rise at 6:18 tomorrow morning.

In the southeastern evening sky can be found the constellation of Hydra the water snake.  Unlike the monster of the same name this Hydra has but one head, which is its most distinctive part.  At 10 p.m. look to the south-southeast.  The head of Hydra is located below a line from the constellation Leo the Lion in the southeast and Gemini high in the southwest.  It is directly below Cancer the crab in the south.  Hydra’s head is a small but distinctive group of 6 stars that make a loop and the snake’s slightly drooping head.  The rest of Hydra wends its way to the southeastern horizon, and eventually ends near the late spring constellation Libra the scales.  Over the next few months the rest of Hydra will slither across the southern horizon.

Times are for the Traverse City/Interlochen area of Michigan. They may be different for your location.

Addendum

Hyrra

Hydra the water snake raising its head below Cancer at 10 p.m. April 4, 2016. Created using Stellarium.

02/18/2016 – Ephemeris – Castor and Pollux

February 18, 2016 Comments off

Ephemeris for Thursday, February 18th.  The Sun will rise at 7:39.  It’ll be up for 10 hours and 35 minutes, setting at 6:14.   The Moon, 3 days past first quarter, will set at 5:28 tomorrow morning.

The star Pollux is at the head of the same named brother of Gemini the twins.  Castor is the  slightly dimmer star right above it.  Pollux is about 34 light years away.  It’s twice as massive as the Sun, and has run out of hydrogen in its core and is in the process of evolving into a red giant star.  One planet, twice as massive as Jupiter has been detected around it.  Castor is at 51 light years away.  There are 6 stars in its system.  The brightest three are visible in telescopes.  Each is a spectroscopic binary, meaning that the companion stars are detected by the Doppler shifts of the lines in their spectra as the stars orbit each other.   The Doppler shift is just one of the many pieces of information revealed by the spectroscope.

Times are for the Traverse City/Interlochen area of Michigan. They may be different for your location.

Addendum

Castor and Pollux

Castro and Pollux with the bright Moon and other bright stars and constellations of winter. 9 p.m. February 18, 2016. Created using Stellarium.

Castor star system

The Castor star system exploded in this JPL/NASA infographic.

The entire infographic is here.

Categories: Ephemeris Program, stars Tags: , ,

01/11/2016 – Ephemeris – Gemini, the half-brothers that are twins

January 11, 2016 Comments off

Ephemeris for Monday, January 11th.  The Sun will rise at 8:18.  It’ll be up for 9 hours and 4 minutes, setting at 5:22.   The Moon, 2 days past new, will set at 7:36 this evening.

Before the Moon brightens the evening sky, lets look at another of the winter constellations.  The constellation Gemini, the Twins is visible high in the east-southeast, above and left of Orion the hunter at 9 p.m.  The namesake stars of the two lads, will be at the left end of Gemini, vertically aligned.  Castor is on top, while Pollux is below.  From them come two lines of stars extending toward Orion that outline the two.  In Greek mythology the lads were half brothers, Castor was fathered by a mere mortal, while Pollux was fathered by Zeus in the famous Leda and the swan affair, but were born together.  When Castor was killed during the quest for the Golden Fleece, Pollux pleaded with Zeus to let him die also, so both appear together in the sky forever.

Times are for the Traverse City/Interlochen area of Michigan. They may be different for your location.

Addendum

Gemini

Gemini revealed by animation. Created using Stellarium and GIMP.