A thing to remember here is that these posts are strictly meant for the particular planet position. Like, today we are looking at Mercury in Gemini, so the description given here may change for you if your Mercury is although in the sign of Gemini but with conjunction with or aspected by other planets.
So, lets see what Mercury can do in Gemini without any conjunction or aspect from any other planet. 1st lets see what these 2 things represent --
Mercury represents communication skills, marketing, calculative ability, younger siblings, hobbies, skills with hands, intelligence, quick decision making, logical thinking, youthfulness etc.
Gemini is the 3rd sign of zodiac belt, so it represents many things related with 3rd house of horoscope like, Communication Skills (either written, oral or even by sign language), Marketing, Business etc. It is a sign basically related with communications and business ideas. Gemini is divided into 2 and half nakshatra of Mrigashira, Ardra and Punarvasu. Gemini's lord is Mercury, which is significator of Communications.
So, the planet of communication is coming into sign of communication. Obviously, communication will be at the center-stage for these people, but a rule of Astrology is that whenever a planet sits in its own sign or aspects its own sign, it protects that placement. So, although these people will be about communications but they will never be unnecessary chatter-boxes. Instead, they will communicate on sound facts and bases. In Gemini & Virgo signs, the real intellect nature of Mercury comes up and these people are always aware of what they are speaking and also what they should not be speaking. Mercury gets really good with details and becomes very analytical and critical of their communications. So, it may be that these people were chatter-boxes in their childhood but as they grow older, they begin self-criticizing their communications and then they become more aware of what they are saying. Any career related with communication, marketing and journalism will be ideally suited to them.
Now, where does these things differ for different people born with Mercury in Gemini. It depends on the Nakshtra Mercury is placed in. So, if Mercury is in Mrigshira Nakshatra, then it will be impacted by Mars as Mars is its lord. If Mercury is in Ardra Nakshatra, then we need to assess Mercury's result through Rahu's position as Ardra is ruled by Rahu. If Mercury is in Punarvasu Nakshatra, then we need to assess Mercury's result through Jupiter's position as Punarvasu is ruled by Jupiter.
Sign lord wise, Mercury is in its own sign. Very peaceful.
Tomorrow, Mercury in Cancer.
Vishal S Saxena - Astrologer