Mercury represents mental connections, communication, commerce, younger people e.g. youth, writing, studying, routine travelling. On this day, any of the foregoing themes may be prevalent for the person with this transit. A person with their natal Mercury in their first house may not experience the day as significantly different from their everyday life.
Unless there are contradictory influences, this is a great time to enter into business negotiations, work or be involved in anything that involves the mind and speech.