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Sky Watch by J. Alex Knoll

Just how rare are two full moons in one month?

The full moon lights up the night Friday, the second full moon of the month, a Blue Moon.     The history of the phrase Blue Moon dates back several hundred years, but the meaning has evolved. As far back as the 16th century, it was an expression of absurdity. I’ll believe that when the moon is blue would have the same effect as saying I’ll believe that when hell freezes over.

Can you spot the International Space Station?

As darkness deepens Thursday, you’ll find the first-quarter moon high in the south-southwest with the bright star Spica seven degrees to its lower right.     Friday night the moon has pulled eastward and is equidistant from Spica to its right and Saturn to its left. Even closer to the left of the moon is the faint star Zubenelgenubi, which marks the fulcrum of the celestial scales Libra. Train binoculars on this star, however, and you’ll see that it is actually a double.

Nine-year, three-billion-mile mission to study solar system’s outer limits

As the sky darkens, Venus and Jupiter appear low in the west. While the gap between the two planets is growing, they are both inching toward Regulus, with Venus two degrees below the star Monday and Tuesday.     Dusk reveals Saturn above the southern horizon with the three stars marking the head of Scorpius beneath it and Antares, the heart of the scorpion, a dozen degrees below.

No need for fireworks here

While you’re waiting for fireworks in the gathering darkness, impress your friends and family with a quick orientation of the celestial lights popping into view.

Earth’s 23.5-degree axis gives us summer, winter and everything between

As evening twilight settles Thursday, look to the western horizon for the nascent crescent moon. Above it are Venus and Jupiter. The bright star Regulus is up there, too, forming a line with Venus and Jupiter, each roughly a dozen degrees from the next. Keep an eye on the two planets as they inch closer together over the next two weeks before a spectacular end-of-month conjunction when they are within one-third degree of one another.

The sun follows its own clock

As darkness falls, first Venus then Jupiter pop into view in the wake of the setting sun. Venus blazes at magnitude –4.4, exponentially brighter than Jupiter at magnitude –2, which still outshines any star. The two planets are inching closer on their way to an end-of-month rendezvous. This week the gap between the two shrinks to 10 degrees — close enough to obscure both with your fist held at arm’s length.

Seach the sky for Berenice’s hair and Ariadne’s crown

The moon wanes to last-quarter Tuesday, rising more than a half-hour later each night, providing an increasingly darker backdrop for sky-watching.     As the evening sky begins to darken, the first lights to appear are the planets Venus and Jupiter high in the west. Then you might notice golden Saturn aglow in the southeast. The next brightest object to appear is Arcturus, almost directly overhead.

Our atmosphere tints summer moons

The moon waxes through the weekend, reaching full phase Tuesday, June 2. This time of year the moon follows a low, lazy arc above the southern horizon. At such a low angle to the horizon, before reaching our eyes the moon’s light must cut through much more of earth’s atmosphere than in winter, when the moon shines high overhead. Gases and trapped moisture within the atmosphere combine to tint the image we see a red, orange or yellow, which explains the names of June’s full moon: the Strawberry Moon, the Rose Moon and the Honey Moon.

After almost 4,000 days in space, this probe died for science

This week Mercury shows its best face in homage to the Messenger spacecraft, which crashed into the planet early morning April 30.     The craft was launched in August 2004 and reached Mercury in March 2011, the first to orbit the innermost planet. Since then it has circled Mercury more than 4,100 times, compiling more data in the process than everything combined before that.

The moon visits the Beehive Cluster and more

The waxing moon reaches first-quarter phase Saturday, shining below and to the left of Jupiter. The moon is near the center of the constellation Cancer.