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- The last supermoon of the year will occur on Friday, September 29.
- A supermoon can appear up to 14% larger and 30% brighter than other times.
- This next supermoon is also a harvest moon.
Get ready, Friday — September 29 — will be the last supermoon of 2023. It's also this year's harvest moon, which is the full moon that occurs closest to the first day of autumn.
A supermoon is a type of full moon that can appear up to 14% bigger and 30% brighter than the faintest moon of the year. That's because it's at its closest point to Earth, named the perigee, according to NASA.