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Sky Watch by J. Alex Knoll

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.

Equinox divides not only day and night but the seasons, too

The new moon winks from sight Friday, obscuring the sun in a total eclipse as seen in a narrow strip over northern oceans. Only residents of a few scattered islands between northern Great Britain and Greenland will see the full eclipse, but viewers across Europe and parts of Asia and Africa will see a partial eclipse.

Here on earth and in the skies, the seasons are changing fast

While our bodies are getting used to the hour shift brought about by Daylight Saving Time, Mother Nature is working fast to counter our dark mornings, and within a month day break will come at the same time it did before we switched our clocks.     At no other point in the year do the days grow longer at a faster pace, as we gain more than three minutes of sunlight each day here in the Northern Hemisphere. Since solstice, December 21, we have gained more than an hour of sunlight in both the morning and at day’s end.

There’s work overhead on the ISS

Thursday evening the waxing gibbous moon stands above the constellation Orion, appearing as if it were the hunter’s head in profile. The next night it is above and to the left of Betelgeuese, Orion’s shoulder, and the two form a nice line with Rigel, the hunter’s foot. Saturday Luna is below the twins of Gemini, Castor and Pollux, and above Procyon, the lead star in the constellation Canis Minor, the Little Dog. Off to the east is brilliant Jupiter. Sunday the moon rests in the middle of a triangle formed by Pollux, Procyon and Jupiter.