January is a very special month for lunar observers: The first month of 2018 will feature twofull moonsand atotal lunar eclipse, or blood moon.
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See the moon phases, and the difference between a waxing and waning crescent or gibbous moon, in this infographic about the lunar cycle each month.See the full infographic.
The January full moon is traditionally called the Full Wolf Moon in the Northern Hemisphere,according to the Old Farmers Almanac. In 2018, it occurs onJan. 1 at 9:24 p.m. EST (0224 GMT). [Note:In Europe and Asia, the full moon occurs Jan. 2 due to time zone differences.] Moonrise in New York City that day is at 4:34 p.m. local time, just a few minutes before sunset which happens at 4:39 p.m. So the Wolf moon will briefly share the sky with the sun, though youll need a view of a relatively flat, unobscured horizon to see it happen.
Januarys full moon will also occur just hours after the moon reaches perigee, its closest point to Earth in its monthly orbit, making it a so-calledsupermoon. At its closest point on Jan. 1, the moon will be221,559 miles (356,565 kilometers) from Earth. On average, the moon is about238,000 miles (382,900 km) from Earth, though its orbit is not perfectly circular. For more on the Jan. 1 supermoon, read our full guide:
Supermoon 2018: When and How to See Januarys Two Full Moons
The Wolf moon (when it reaches full phase)will be in the constellation Gemini, according to heavens-above.com, roughly along a line between Pollux (Beta Geminorum) and Betelgeuse (Alpha Orionis). The moon is so bright that it will make the deep sky objects nearby the Orion nebula, for example a bit harder to see if the sky isnt perfectly clear.
An interesting artifact of celestial motions is that on that first full moon night, none of the traditionalnaked-eye planets Mercury, Venus, Mars, Jupiter or Saturn will be visible at all from the northeastern U.S.when the moon reaches full phase. Mars and Jupiter dont rise in New York City until the morning of Jan. 2 at 2:54 a.m. and 3:04 a.m. local time, respectively, and Saturn doesnt poke above the horizon until 6:37 a.m., just about 42 minutes before sunrise.
Blood moon lunar eclipse & supermoon
That second full moon has also been dubbed a supermoon a full moon that roughly coincides with perigee, the point in the moons orbit when it is closest to Earth. In January the moon reaches perigee on the night of Jan. 30, and reaches peak fullness on the night of Jan. 31.
Heres our full eclipse guide:Super Blue Blood-Moon 2018: When, Where and How to See It
The moons distance from Earth can vary a bit because the orbit isnt perfectly circular, so even though the average distance is 238,855 miles (384,400 kilometers) on Jan. 30 it will be only 221,559 miles (356,565 kilometers) away. On average, the apparent size of the moon in the sky is about 0.5 degrees across, or about 31 arcminutes. (Check outSpace.coms guideto measuring distances on the sky for more information.) During this supermoon, though, our lunar neighbor will be 33.51 arcminutes across, or 0.56 degrees. As a result, it will appear 11 percent larger than an average full moon. For most skywatchers, that difference is difficult to see.While the moon is always a beautiful sight in the sky, occasionally skywatchers are treated to a special supermoon. Do you know at what phase a supermoon occurs? Or why supermoons dont happen every month?Supermoon Quiz! Are You Super or Just Lost in Space?While the moon is always a beautiful sight in the sky, occasionally skywatchers are treated to a special supermoon. Do you know at what phase a supermoon occurs? Or why supermoons dont happen every month?
Supermoons can appear 30 percent brighter and up to 14 percent larger than typical full moons.Learn what makes a big full moon a true supermoon in this infographic.
The months second full moon, on Jan. 31, will feature a total lunar eclipse, or a blood moon.. If you live in the western U.S., Hawaii, or the Eastern half of Asia, youll see the moon turn blood-red as it enters the deepest parts of the Earths shadow during the eclipse.A total lunar eclipse is one where the moon passes through the central region of the shadow of the Earth, which describes a cone that stretches away from the sun. At other times the moon only passes through the shadow partway, and thats a partial lunar eclipse.
During a total lunar eclipse, the surface of the moon appears to turn red because red light that passes through the Earths atmosphere is bent; the atmosphere is acting like a lens. In addition, red light is scattered less than blue. So the red light makes it through and shines on the lunar surface, even though the moon is in shadow. This is the same mechanism that makes sunsets look red at sunset the suns light has to pass through more of the Earths air and the shorter-wavelength blue parts of the spectrum are scattered away.
Some places on Earth will feature a spectacular view of the blood moon rising or setting on the day of the eclipse. Observers on the East Coast of the U.S. on Jan. 31 wont get that the moon will only just be entering the darker part of the Earths shadow when it sets at 7:04 a.m. in New York City. (Fullness occurs at 8:26 a.m. local time in New York, but the moon will be out of view then). On the other hand, if you are in Chicago, the eclipse will reach its maximum at 6:56 a.m. local time, and the moon will be setting at 7:03 a.m. As one moves west, the eclipse happens earlier in the evening, and by the time one reaches Hawaii the entire eclipse is visible well before the moon sets (at 7:19 a.m. local time in Honolulu).
If you live in Moscow orlocations roughly on a northwest-to-southeastern line from there, the moon will be emerging from the Earths shadow as it rises. This line marks the terminator of the Earth the line between the day side and night side. (Its not straight north-south because the Earth is tilted on its axis).
In Moscow, moonrise is at 5:01 p.m. local time and the moon will still look red for another six minutes. Moving aoutheast to Karachi, the view is better; at 6:13 p.m. local time the moon rises, and it reaches the maximum eclipse at 6:29 p.m., making for some spectacular photo-ops.
Editors note:If you snap an awesome photo of the moon that youd like to share with Space.com and our news partners for a potential story or gallery, send images and comments in .
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Michael was a science writer for the Idaho National Laboratory and has been an intern at m, The Salinas Californian newspaper, and the SLAC National Accelerator Laboratory. He has also worked as a herpetologist and wildlife biologist. He has a Ph.D. in evolutionary biology from the University of Sydney, Australia, a bachelors degree from the University of Arizona, and a graduate certificate in science writing from the University of California, Santa Cruz. To find out what his latest project is, you can follow Mike onGoogle+.
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