# 2026 lunar cycle and astronomical phenomena

> Developing situation record from CLSTR: https://clstr.news/situations/2026-lunar-cycle-and-astronomical-phenomena
> Updated: 2026-10-12T06:19:00.000Z. Sources: 5. Developments: 2.

In late 2026, astronomical observations highlight specific lunar cycles and their effects. The Zijin Mountain Observatory of the Chinese Academy of Sciences reported that the Mid-Autumn Festival would feature a rare full moon occurring on the 17th day of the lunar month rather than the traditional 15th. This phenomenon, occurring on the morning of September 27, 2026, has a statistical probability of only 14% between the years 2001 and 2100 due to the Moon’s elliptical orbit and fluctuating orbital speeds.

Further lunar data for 2026 indicates a calendar consisting of thirteen full moon dates and twelve new moon dates. In October 2026, a new moon was scheduled for October 10, followed by a full moon on October 26. Beyond astronomical tracking, studies suggest that the brightness of full moons may influence human sleep rhythms by reducing melatonin production.

## Timeline

### 2026-10-12: Moon phases and lunar calendar schedule for 2026

The 2026 lunar calendar includes thirteen full moons and twelve new moons, with October's full moon occurring on the 26th.

2 sources. https://clstr.news/cluster/moon-phases-and-lunar-calendar-schedule-for-2026

### 2026-09-25: Zijin Mountain Observatory reports rare full moon for 2026 Mid-Autumn Festival

In 2026, the Mid-Autumn Festival moon will reach its fullest phase on the 17th day of the lunar month, a rare event with a 14% probability occurring between 2001 and 2100.

3 sources. https://clstr.news/cluster/zijin-mountain-observatory-reports-rare-full-moon-for-2026-mid-autumn-festival

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Cite as: 2026 lunar cycle and astronomical phenomena. CLSTR, https://clstr.news/situations/2026-lunar-cycle-and-astronomical-phenomena