Mercury, planet of the mind, comes together in Sagittarius with the Sun, star of self-expression, from December 29th, 2025, to January 14th, 2026.

Sun and Mercury create Budhaditya Yoga, a combination for study, public speaking, and business acumen, which you put to your advantage. Mercury in Mula at the start of this transit is in a different part of Sagittarius from the Sun in Purva Ashadha, and is not burnt by the solar rays until after January 10th. You have ego invested in your thinking, and there is also a tendency for you to over-analyse every problem, but Mercury retains its ability to rationalise and act under its own power.

The Sun in a friendly sign favours a philosophical approach and seeing your situation from a broader point of view. Mercury, however, prefers facts and details, so you need to focus on the fine print in a negotiation and try to iron out any flaws in your plans. A flash of pure inspiration arrives, and you may only work out the technical side after the event. Try to avoid making any issue solely a matter of opinion, however. A teacher or educational authority appreciates your flair for a subject, and you can promote yourself as a knowledge-leader and mentor figure.

You can teach a subject very well, from a technical and practical standpoint. Both Sun and Mercury are part of a wider collection of planets in Sagittarius at this point, and are also affected by slow-moving Jupiter and Saturn. Your decisions at the start of the new year have greater importance, so take your time and tune out surface noise before committing to a plan or purchase.