Enjoying EarthSky? Subscribe.

265,709 subscribers and counting ...

January 1-2 full moon is a supermoon

It’s the 1st of 2 full supermoons in January 2018, and it’s the closest and largest supermoon of this year. Look for higher-than-usual tides in the days following this full moon.

December’s full moon was a supermoon, too. Peter Lowenstein in Mutare, Zimbabwe contributed this composite image of the rising full supermoon on the evening of December 3, 2017.

The first (or second) day of the new year features a full moon and 2018’s largest and closest supermoon. In other words, this full moon will be near perigee, or the closest point of the moon in orbit for this month. Your eye probably can’t detect a difference in size between this supermoon and any ordinary full moon (although experienced observers say they can detect a size difference). But the supermoon is substantially brighter than an ordinary full moon. The moon turns precisely full at the same instant worldwide (January 2, 2018 at 2:24 UTC), the time – and possibly the date – of the full moon varies according to one’s time zone. At North American and U.S. time zones, the full moon happens on the evening of January 1 at these times:

22:24 (10:24 p.m.) Atlantic Standard Time (AST)
21:24 (9:24 p.m.) Eastern Standard Time (EST)
20:24 (8:24 p.m.) Central Standard Time (CST)
19:24 (7:24 p.m.) Mountain Standard Time (MST)
18:24 (6:24 p.m.) Pacific Standard Time (PST)
17:24 (5:24 p.m.) Alaska Standard Time (AKST)
16:24 (4:24 p.m.) Hawaiian Standard Time (HST)

Like every full moon, this one is opposite the sun from Earth. It’ll rise in the east as the sun sets in the west, ascend to its highest point in the sky in the middle of the night, and set in the west around dawn. Clouded out? The Virtual Telescope Project in Rome is offering an online viewing of the January 1 supermoon.

Join the Virtual Telescope Project in Rome for an online viewing of the January 1, 2018 supermoon.

As it happens, January will have two full moons. The second one is a supermoon, too. Some people will call the full moon on January 31 a Blue Moon because it’ll be the second of two full moons in one calendar month.

Moreover, the January 31, 2018 supermoon will stage a total eclipse of the moon: a super Blue Moon eclipse!

Read more: What is a supermoon?

Here’s a comparison between the December 3 full moon at perigee (closest to Earth for the month) and the year’s farthest full moon in June at apogee (farthest from Earth for the month) by Muzamir Mazlan at Telok Kemang Observatory, Port Dickson, Malaysia.

As the moon orbits Earth, it changes phase in an orderly way. Follow these links to understand the various phases of the moon.

Four keys to understanding moon phases

Where’s the moon? Waxing crescent
Where’s the moon? First quarter
Where’s the moon? Waxing gibbous
What’s special about a full moon?
Where’s the moon? Waning gibbous
Where’s the moon? Last quarter
Where’s the moon? Waning crescent
Where’s the moon? New phase

Bottom line: A full moon looks full because it’s opposite Earth from the sun, showing us its fully lighted hemisphere or day side. The January 1-2, 2018 full moon is a supermoon.

Can you tell me the full moon names?

Deborah Byrd