December 2026 Moon Phase Calendar
Updated · Daily moon data sampled at 8:00 p.m. Eastern Time (UTC shown where relevant)
The daily phase and illumination below are sampled at 8:00 p.m. Eastern Time. Principal phases are exact astronomical instants. Moonrise is for New York City and may occur on a different local date elsewhere.
September 2026 Moon Phase Calendar — 13-month
Gregorian dates: September 10, 2026 – October 7, 2026.
Switching keeps the reference date, October 1, 2026. Weekday headings follow the fixed calendar, not Gregorian weekdays. Each month has four complete weeks; Sol sits between June and July. The detail tables below keep their stated Gregorian date ranges.
| Sunday | Monday | Tuesday | Wednesday | Thursday | Friday | Saturday |
|---|---|---|---|---|---|---|
 0%September 10
New Moon 11:26 p.m. EDT
|
0.9%September 11
|
4.1%September 12
|
 9.3%September 13
|
16%September 14
|
24%September 15
|
 32.7%September 16
|
|
42%September 17
|
51.4%September 18
First Quarter 4:43 p.m. EDT
|
60.8%September 19
|
 69.9%September 20
|
78.3%September 21
|
85.8%September 22
|
92.1%September 23
|
 96.7%September 24
|
99.4%September 25
|
99.8%September 26
Full Moon 12:48 p.m. EDT
|
97.8%September 27
|
 93.4%September 28
|
86.6%September 29
|
77.9%September 30
|
 67.7%October 1
|
56.5%October 2
|
45.1%October 3
Last Quarter 9:24 a.m. EDT
|
34%October 4
|
 23.7%October 5
|
15%October 6
|
8%October 7
|
Daily phase names group the cycle into eight broad phase sectors, using progress between exact astronomical events. They describe the 8 p.m. Eastern sample, not the instant of a new moon, quarter moon, or full moon. The tables list those exact principal-phase instants separately.
December 2026 Moon Phases — Exact Times
| Phase | Date | Time (ET) | Time (UTC) | 13 month date |
|---|---|---|---|---|
| Last Quarter | 1:08 a.m. EST | 6:08 a.m. UTC | November 27, 2026 | |
| New Moon | 7:51 p.m. EST | 12:51 a.m. UTC | December 6, 2026 | |
| First Quarter | 12:42 a.m. EST | 5:42 a.m. UTC | December 15, 2026 | |
| Full Moon | 8:28 p.m. EST | 1:28 a.m. UTC | December 21, 2026 | |
| Last Quarter | 1:59 p.m. EST | 6:59 p.m. UTC | December 28, 2026 |
Special events and calculation notes
- : Supermoon (geocentric distance <= 360,000 km)
Eclipse classifications are from NASA GSFC. On this site, “supermoon” means a full moon with a computed geocentric distance of 360,000 km or less.
Daily Moon Phase, Illumination, and Moonrise
“No moonrise” means no rise occurs during that midnight-to-midnight Eastern calendar date at the New York City observer location; it does not mean the moon never rises.