Mercury sign calculator
Mercury changes sign every few weeks and retrogrades three times a year. A birth date is usually enough for the sign; time places it in a house.
Calculate to place the sign — a star map and a short reading follow.
Mercury in the natal chart
Mercury changes sign every few weeks and stations retrograde about three times a year. A birth date is enough for the sign on most days; the house and the exact degree still want a time. Positions are tropical and geocentric, same engine as the full natal chart.