Mercury in Sagittarius 2026: computed transit dates, retrograde loops and what the sky pattern means while Mercury — planet of thinking, communication and how you learn — crosses the fire sign of exploration, optimism and the long view.
| Date | Event |
|---|---|
| October 29, 2025 | Mercury enters Sagittarius (from Scorpio) |
| November 19, 2025 | Mercury leaves Sagittarius (into Scorpio) |
| December 11, 2025 | Mercury enters Sagittarius (from Scorpio) |
| January 01, 2026 | Mercury leaves Sagittarius (into Capricorn) |
| December 06, 2026 | Mercury enters Sagittarius (from Scorpio) |
| December 25, 2026 | Mercury leaves Sagittarius (into Capricorn) |
While Mercury moves through Sagittarius, its themes (thinking, communication and how you learn) are expressed through exploration, optimism and the long view. For everyone, this is a background weather system; for Sagittarius Suns and risings, it is front-page news, lighting the first house of self-presentation.
Initiate on the ingress dates above; revise during retrograde windows; consolidate after the final exit. Signs that benefit most: fellow Fire signs Aries, Leo.
Positions computed with the Swiss Ephemeris for September 28, 2026, 12:00 UTC — live astronomical data, verified daily, not static text.
Moon phase: Waning Gibbous (Sun–Moon elongation 203°)
Closest exact aspects: Sun trine Uranus (119.8°); Neptune sextile Pluto (59.8°); Moon opposition Mercury (178.9°); Moon square Mars (91.8°); Sun trine Pluto (117.8°).
How this lands for Mercury transit through Sagittarius (currently at 27°18' Libra): cross-reference today’s live positions with your natal chart for precise personal timing.