Sky ArchiveTonight

Moon and Regulus late night until dawn

Tonight – November 10, 2017 – you’ll have to stay up late, or get up Saturday before dawn, to see the wide waning crescent moon coupling up with Regulus, brightest star in the constellation Leo the Lion. The two luminaries will be highest up for the night around dawn Saturday.

Tips for watching the North Taurid meteors

As darkness is giving way to dawn, notice the relationship between the moon, Regulus, and a very bright object in the direction of sunrise. Venus is the brightest planet and brightest object in the sky besides the sun and moon. The lighted portion of the moon will be pointing toward it on Saturday and in the coming mornings. Plus you might glimpse a slightly fainter – but still very bright – planet below Venus. That’ll be Jupiter, which is just now emerging from the dawn after being behind the sun from Earth in late October. And a third planet, faint Mars, is up there, too. See the sky chart below.

And know that Jupiter is now edging higher in the dawn sky! Jupiter and Venus will have a spectacular conjunction on November 13.

Watch as the waning crescent moon swings by 3 morning planets and 1 bright star in the November morning sky. And watch for the Venus-Jupiter conjunction on the morning of November 13.

If you live in southern Alaska, you can watch the moon occult – cover over – Regulus before dawn on November 11, 2017. At Anchorage, Alaska, for instance, Regulus will disappear behind the moon’s illuminated side at 7:07:17 a.m. local time and then reappear from behind the moon’s dark side at 7:25:18 local time.

Click here for more about the November 11 occultation of Regulus.

Worldwide map via IOTA. Everyplace in between the solid white lines sees the lunar occultation of Regulus in a nighttime sky. The very limited area between the blue lines sees the occultation at dawn November 11, and the area of the world in between the dotted red lines has the occultation occurring in a daytime sky on November 11. Click here for more information.

Regulus is the only first-magnitude star to sit almost squarely on the ecliptic, which marks the path of the sun, moon and planets across our sky. In our day and age, the sun’s yearly conjunction with Regulus happens on or near August 23. That’s about two months after the June solstice, or about a month before the September equinox.

Ancient astronomers once thought the sun literally moved through the constellations of the zodiac, while the Earth remained at rest at the center of the universe. Of course, we now know that the Earth revolves around the sun, and that the sun resides at the center of our solar system. We also know that the sun’s apparent daily motion in front of the backdrop stars is really a reflection of Earth revolving around the sun.

The ecliptic is actually the Earth’s orbital plane projected onto the constellations of the zodiac.

Because the planets orbit the sun, and the moon orbits Earth, on nearly the same plane that Earth circles the sun, the moon and planets are always found on or near the ecliptic. If you’re an early bird, waking up before the sun, then use the moon, the star Regulus and the early morning planets Venus and Jupiter to help you envision the ecliptic with the mind’s-eye over the next several days.

When you see Regulus near the moon on the mornings of November 11 and 12, 2017, remember … it’s a much larger star than our sun. Image via The Night Sky Guy.

Bottom line: See the waning crescent moon near Regulus from around midnight until dawn on November 11, 2017. Then watch over the coming mornings as the waning crescent moon sweeps near Regulus and then toward the planets Mars, Venus and Jupiter.

EarthSky lunar calendars are cool! They make great gifts. Order now. Going fast!

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November 10, 2017
Sky Archive

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Bruce McClure

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