The full moon tonight is the 4th full moon of the summer.
It is rare to have 4 full moons in one season.
The last time this happened was in the spring of 2010 with the next occurrence in the spring of 2016.
The 3rd full moon of a 4 full moon season is known as a Blue Moon.
Summer runs from June 20th to September 21st in Arizona this year.
The other full moons this summer were on June 23rd, July 21st, and August 20th.
Moonrise is at 5:52 PM today with moonset at 6:21 AM tomorrow morning.
The full moon occurs at 4:13 AM.
Tonight's full moon is nicknamed the 'Harvest Moon'.
The last full moon prior to the start of fall is important to farmers in the northern Hemisphere, who work long hours in the fields harvesting crops this time of year.
Before mechanical equipment sped up the harvesting process it was common for farmers to work well into the night by the light of the full moon.
Even today, farmers may be in the fields late into the night to remove crops before bad weather hits.
The autumnal equinox, which kicks off fall, happens at 1:44 PM Sunday, September 21st.