Sky calendar

Every date on these pages is calculated from astronomical positions, not copied from a table. Use them to plan around the Moon, check when a retrograde begins and ends, or see which sign a planet is moving through.

Updated 3 Nov 2026 · Times are in UTC.

The next eight weeks

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Guides

Year calendars

How these dates are calculated

Positions come from Astronomy Engine, an open-source library based on the same planetary theory used for professional almanacs, and are accurate to well under a minute of time for these events. Signs are the tropical (Western) zodiac unless a page says otherwise. Stations, the moments a planet turns retrograde or direct, are found by checking the planet’s apparent motion minute by minute.