When a full moon appears at perigee it is slightly brighter and larger than a regular full moon, earning it the name of 'supermoon'. For the rest of the year, the hemisphere that is tilted towards the sun tends to have longer days with brighter illumination and the other side shorter and dimmer.
The equal parts daylight and nighttime are so rare because the Earth is actually always leaning in one direction or another.
It's also the day for the last Super Moon of 2019.
This full moon is called a worm moon because in cold climates the ground begins to thaw and earthworms appear. The March full moon is also sometimes referred to as the "sap moon" as it marks the time of year when sugar maples begin to release their sap.
Google is celebrating March 20 as the first day of the spring season with an animated doodle named ' Spring equinox'. Extending the logic, the northern and the southern hemispheres would be equally illuminated. The last time that happened was in March 2000, according to EarthSky.
The moon will reach its full phase around 9:43 p.m. EDT and coincides with the spring equinox, which will occur just before 6 p.m. EDT.
Trump wants GM CEO 'to do something quickly' to reopen OH plant
The union is the United Automobile Workers, which represents the employees who lost their jobs in the Lordstown closure. In the second tweet, President Trump also claimed "much better" automakers are coming to the U.S.
The spring equinox marks one of the two times a year when day and night are almost the same length.
The spring equinox occurs when the sun is directly in line with the equator.
That specific combination of these three factors - the Full Moon, the Equinox, and a Supermoon - hasn't been seen for over a hundred years!
This year the full moon in March was slated to happen on the same day as the equinox.
So it's an "equal night", which is where the word equinox originated: the two Latin words aequus (equal) and nox (night), according to the National Oceanic and Atmospheric Administration.
The date of the equinox changes from year to year to account for the fact that the Earth doesn't take exactly 365 days to make a complete revolution around the sun.