NPS/Joel Cadoff
The next full moon is called the Worm Moon. Also, there will be a total lunar eclipse this full moon. The Moon will be full early Friday morning, March 14, at 2:55 a.m. EDT, but will appear full for about three days around this time, from Wednesday evening into Saturday morning.
As the Moon passes opposite the Sun it will move through the shadow of Earth creating a total eclipse of the Moon. The Moon will begin entering the partial shadow Thursday night at 11:57 p.m. EDT, but the gradual dimming of the Moon will not be noticeable until it starts to enter the full shadow Friday morning at 1:09 a.m. The round shadow of Earth will gradually shift across the face of the Moon (from lower left to upper right) until the Moon is fully shaded beginning at 2:26 a.m. The period of full shadow, or total eclipse, will last about 65 minutes, reaching the greatest eclipse at 2:59 a.m. and ending at 3:31 a.m. Even though it will be in full shadow, the Moon will still be visible. The glow of all of the sunrises and sunsets on Earth will give the Moon a reddish-brown hue, sometimes called a "Blood Moon" - although this name is also used for one of the full moons near the start of fall. From 3:31 a.m. until 4:48 a.m., the Moon will exit the full shadow of Earth, with the round shadow again shifting across the face of the Moon (from upper left to lower right). The Moon will leave the last of the partial shadow at 6 a.m. ending this eclipse.
The Maine Farmers' Almanac began publishing Native American names for full moons in the 1930s, and these names are now widely known and used. According to this almanac, the tribes of the northeastern U.S. called the full moon in March the Crow, Crust, Sap, Sugar, or Worm Moon. The more northern tribes of the northeastern United States knew this as the Crow Moon, with the cawing of crows signaling the end of winter. Other northern names were the Crust Moon, because the snow cover became crusted from thawing by day and freezing by night, or the Sap (or Sugar) Moon as this was the time for tapping maple trees. The more southern tribes called this the Worm Moon after the earthworm casts that appeared as the ground thawed. It makes sense that only the southern tribes called this the Worm Moon. When glaciers covered the northern part of North America they wiped out the native earthworms. After these glaciers melted about 12,000 years ago the more northern forests grew back without earthworms. Most of the earthworms in these areas are invasive species introduced from Europe and Asia.
Continuing the tradition of naming moons after prominent phenomena tied to the time of year, a few years ago my friend Tom Van Wagner suggested naming this the Pothole Moon. It may be a case of confirmation bias, but whether in my car or on my bicycle I've noticed more potholes lately.
