The moon becomes full tomorrow, March 12. What is known as the Full Worm Moon was so named by the American Indians who used the moon to track seasons and this was the time of year that the ground began to soften enough for earthworm casts to appear, signifying the return of migrating birds. Colonial Americans adopted these names, especially those of the local Algonquin tribes who lived between New England and Lake Superior.
Roots also begin to push their way upward through the soil and the Earth experiences a rebirth as it awakens from its winter slumber – the Eternal Return. In some regions, this moon is also known as the Sap Moon because it marks the time when maple sap begins to flow and the annual tapping of maple trees begins.
In the Untied States, the moon reaches its full phase at 10:56 (EST) tomorrow morning. To experience the full effect of the moon, moonrise is at 6:56 p.m. in Portland, Maine; at 7:39 p.m. in Texarkana, Texas; and at 7:32 p.m. in Seattle.
Sources:The Old Farmer’s Almanac and Time and Date.