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Now Showing: The Summer Triangle

Now Showing: The Summer Triangle

Instead of turning on the TV tonight, why not turn head outside to see if you can spot the “Summer Triangle.”

Joe Rao, Farmers’ Almanac’s contributing astronomer, tells us that those of us living in the Northen Hemisphere can see the famous “Summer Triangle” asterism at some point during the night any time of year. But summer is when it’s at its most prominent. It appears toward the south as soon as it is dark and climbs high overhead by late evening.

“You can’t miss it because the triangle is composed of three of the brightest stars in the sky, each of which is the brightest star in its own constellation,” says Rao.

The 3 Stars of the Summer Triangle

The brightest is the bluish-white star Vega, in the constellation Lyra the Lyre. Next in brightness is yellow-white Altair in the constellation Aquila, the Eagle. Finally, there is white Deneb, in Cygnus, the Swan.

From our viewpoint, Vega appears twice as bright as Altair and more than three times brighter than Deneb. But sometimes things are not always what they seem. Astronomers know, for instance, that Vega clearly is more luminous compared to Altair, because it’s situated at a greater distance from us. Altair is 17 light-years away, while Vega is 25. The light you see from Vega tonight started on its journey to Earth in 1994.


Vega actually pales in comparison with Deneb, one of the greatest supergiant stars known. Deneb’s distance measures 1,467 light-years from Earth, with a luminosity computed to be more than 80,000 times that of our Sun. But because its light takes nearly 15 centuries to reach us, Deneb merely appears as a fairly conspicuous but by no means particularly notable star.

Check out this NASA picture of the day of the Summer Triangle (mouse over the picture to see it appear).

Check it out. Tonight, when the sky is dark, see if you can spot this triangle.

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If you notice a hole in the upper left-hand corner of your Farmers' Almanac, don't return it to the store! That hole isn't a defect; it's a part of history. Starting with the first edition of the Farmers' Almanac in 1818, readers used to nail holes into the corners to hang it up in their homes, barns, and outhouses (to provide both reading material and toilet paper). In 1919, the Almanac's publishers began pre-drilling holes in the corners to make it even easier for readers to keep all of that invaluable information (and paper) handy.

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