A nearly full supermoon rises over Route 22 in Bethlehem on April 6, 2020. The full moon in April is known as the pink moon, a reference to the flora of the season. The next full moon is the flower moon May 7.

The last of four supermoons in 2020 may peak through the clouds this week.

The full moon in May, known as the flower moon, will appear in the sky Thursday morning, the fourth and final supermoon of the year, according to the loose definition of the term.

According to NASA, the term “supermoon” originated in 1979 in reference to any full or new moon that occurs within 90% of perigee, the closest point to Earth in the moon’s orbit. That makes the full moon appear slightly larger and brighter, though most casual observers probably won’t notice a difference.

Some definitions are more strict, but NASA says that the February snow moon, March worm moon, April pink moon and May flower moon all meet the 90% criteria.

A supermoon rises over Phillipsburg, New Jersey, as seen from Easton, Pennsylvania, on March 9, 2020.

Like the pink moon in April, the flower moon in May is named for the spring flora that appears this time of year, per The Old Farmer’s Almanac.

The flower moon will reach its full phase at 6:45 a.m. Thursday, May 7, about 30 minutes after setting on the East Coast, according to timeanddate.com. It rises at 7:16 p.m. the night before, and will rise again at 8:33 p.m. Thursday evening.

13 full moons in 2020

These are the dates and times of each full moon appearing in 2020, along with the most popular nicknames. The times are in the Eastern time zone in the United States.

DATE   TIME   NICKNAMES 

Jan. 10	2:21 p.m.	wolf moon
Feb. 9	2:33 a.m.	snow moon
March 9	1:47 p.m.	worm moon / supermoon
April 7	10:35 p.m.	pink moon / supermoon
May 7	6:45 a.m.	flower moon
June 5	3:12 p.m.	strawberry moon
July 5	12:44 a.m.	buck moon / thunder moon
Aug. 3	11:58 a.m.	sturgeon moon
Sept. 2	1:22 a.m.	corn moon
Oct. 1	5:05 p.m.	harvest moon
Oct. 31	10:49 a.m.	blue moon
Nov. 30	4:29 a.m.	beaver moon
Dec. 29	10:28 p.m.	cold moon

The Lehigh Valley weather forecast by the National Weather Service calls for rain on Wednesday night and partly cloudy skies Thursday night.

The next full moon will be the strawberry moon on June 5.