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In the Sky This Month

Mars takes center stage this month. The planet shines brightest for the year, outperforming all but the Moon and Jupiter. Saturn trails close behind it, and it’s nearing its peak for 2016 as well. In the meantime, Virgo climbs higher into the evening sky, Leo begins to nose down toward the western horizon, and the twins of Gemini begin to disappear in the western twilight by month’s end.

May 2: Disappearing Sirius

Sirius, the brightest star in the night sky, is disappearing in the evening twilight. Look for the star blazing low in the southwest beginning in early twilight. It sets a couple of hours after sunset.

May 3: Evening Mars

Mars is pushing into the pre-midnight sky, getting brighter as it does so. Tonight, look for the orange planet quite low in the southeast by 11 or 11:30 p.m. The star Antares is close below Mars, with the planet Saturn farther to the lower left of Mars.

May 4: Mu Herculis

Like its constellation, Hercules, the star Mu Herculis is faint and difficult to find. Yet the star is of particular interest because in some ways it seems to be an older version of the Sun, so it’s had plenty of time to give rise to life.

May 5: Head Cases

The star Rasalhague represents the head of Ophiuchus, the serpent bearer, while Rasalgethi is the head of Hercules. Rasalhague climbs into good view in the east by 10:30 p.m., with fainter Rasalgethi above it. They are separated by about the width of three fingers held at arm’s length.

May 6: Mercury Transit

A tiny black dot will cross the face of the Sun early Monday: Mercury, the Sun’s closest planet. The entire event, known as a transit, will be visible across the eastern half of the United States, with the rest of the country seeing most of it.

May 7: Evening Moon

A vanishingly thin crescent Moon just peeks into view in the west as twilight begins to fade this evening. You will need a clear horizon to spot it. The Moon will climb higher on each succeeding evening, with the crescent growing fatter.

May 8: Mercury Transit II

The planet Mercury will transit the Sun tomorrow, looking like a tiny black dot crossing the solar disk. The transit begins at 6:12 a.m. CDT and ends five-and-a-half hours later. Don’t look at the Sun, however, because it’s dangerously bright. Instead, view the transit online.

Current moon phase

New MoonNew May 6, 2:30 pm

First QuarterFirst May 13, 12:02 pm

Full MoonFull May 21, 4:14 pm

Last quarterLast May 29, 7:12 am

Times are U.S. Central Time.

Perigee May 5

Apogee May 18

The full Moon of May is known as the Milk Moon, Flower Moon, or Corn Moon.