Let’s take a look at those things which matter here –
Mercury - It represents communication skills, marketing, calculative ability, younger siblings, hobbies, skills with hands, intelligence, quick decision making, logical thinking, youthfulness etc.
For Libra Ascendant people, Mercury rules the 9th house & 12th house of chart with its sign Gemini & Virgo. So, let’s look at 9th house, 12th house, Gemini and Virgo too.
9th house - It represents Higher Education, Philosophy, Religion, Law, Faith, Fortune, Gurus, Teachings of Father (as father is 1st Guru we get) etc.
12th house - It is house of Losses, Expenses, Isolated Places, Spirituality, Foreign Lands, Foreign Companies, Imagination, Sub-Concious Mind, Charity, Donation, Asylums, Jails, Hospitals, Hidden Talent and Secrets of Other World etc
Gemini - It 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.
Virgo - It is the 6th sign of zodiac belt, hence it represents almost all the things which are represented by the 6th house of horoscope like Debts, Diseases, Obstacles, Serving the under-privileged, Service Life, etc. Besides this, Virgo represents analytical or critical skills of people, being perfectionist and healing abilities. Virgo's basic representation is the lady coming in boat with wheat and herbs in her hands. So, Virgo is basically a sign of healing. Virgo consists of 2 and half nakshatra. i.e. Uttara-Phalguni, Hasta and Chitra. Virgo's lord is Mercury.
What will Mercury do in Aspect? – Now, Mercury can be sitting in any house of chart for a Libra Ascendant person.1st of all, Mercury will take the energy of house of chart, it rules with Gemini & Virgo sign, and take it to the house where it sits. Then from the house it sits, it will throw its aspect on the 7th house from its place. Now, as Mercury basically represents Communication, Collection of Information, Travelling, Teaching, Counselling and Advising, Mercury will make person communicate and counsel people related to the house it is aspecting about the houses it rules and also will make person collect information about the house it is aspecting.
Things which I still can’t cover – Although, I am trying to make it a detailed analysis of planetary aspects but I still can’t cover few things like dignity of planet involved, like Mercury conjunct with other planets, if there are planets in 7th house from Mercury where it aspects in which case those planets will aspect back at Mercury and impact it, and planets aspecting Mercury from other houses. That’s why, no matter how detailed analysis you do in Astrology, there are still few things uncovered and that just shows the limits of Human Efforts.
Now, let’s see the meaning and impact of Mercury's aspect through different houses for Libra Ascendant people.
Mercury in 1st house – Mercury is in Libra here. This shows someone as counselor or teacher here. They can be teacher or counselor in field of religion or spirituality. They can be very analytical and critical in spiritual matters. Its aspect on 7th house shows someone wants to communicate with other people on matters of religion and spirituality. To their spouse also they want to talk about religious and spiritual stuff. They can be Preachers too. Communication is very necessary here to prosper the relation.
Mercury in 2nd house –Mercury is in Scorpio here. This shows someone who has higher education in Occult/Mysticism and then it helps him in gaining wealth. They understand spirituality better when they communicate about occult and mysticism. Mercury's aspect on 8th house also shows that they like to interact and serve others on matters of Occult. They love collecting mystical information.
Mercury in 3rd house – Mercury is in Sagittarius here. This is a person who is all into higher education, religion, philosophy etc. This is very much a teacher, preacher or professor kind of person. Its aspect on 9th house also suggests that person is all into higher education and wants to teach, preach and counsel people. They want to learn more and more on matters of higher learning to improve themselves.
Mercury in 4th house – Mercury is in Capricorn here. This shows someone working as a Counselor or Lawyer at Local Govt. 4th house represents Home Land or Local Government, so this shows someone who serves people of his home land in matters of Law and Govt. Its aspect on 10th house also suggests that they want to communicate with people in authority, government and law. They like to collect info about Law and Govt.
Mercury in 5th house – Mercury is in Aquarius. This shows someone who takes higher education in field of Science and Technology. Person might even travel to Foreign Lands to get education. Its aspect on 11th house suggests that they will utilize their higher education in science or technology to serve humanitarian causes and to help the humanity. Their inventions are going to help humanity overall.
Mercury in 6th house – Mercury is debilitated in Pisces here. This shows someone who like to communicate about religion and spirituality in his daily work. That means he can be a counselor or writer in this field. This also shows someone as a very good imaginative writer. His writing and counselling helps people to resolve their obstacles. Its aspect on 12th house suggests that they love travelling to foreign lands, they may be serving in foreign lands/companies in communication based work. They like to collect information on spirituality.
Mercury in 7th house – Mercury will be in Aries here. This shows someone who connects with other people through his communications on religion, philosophy, law and spirituality. This shows a Teacher, Preacher or a Lawyer in profession. At the same time, they will be very harsh and direct with their speech. Its aspect on 1st house shows that they will realize themselves and connect with self only when they are able to connect with others as stated above.
Mercury in 8th house – Here Mercury is in Taurus.This shows a natural inclination towards occult and mysticism. Also, they will be very good at handling finance and wealth. Hence, they can be financial consultants or wealth managers. They can serve others in financial field. Its aspect on 2nd house shows that serving others brings them wealth and they are keen to know how to improve wealth.
Mercury in 9th house – Mercury is in own sign Gemini here. This shows that person is highly communicative in matters of higher education, philosophy & law etc. They can be teacher, preacher and counsels. They love traveling to different places and meeting people. They may be well-versed with many languages. Its aspect on 3rd house shows their proficiency in communication and counselling. They like to educate themselves more and more to improve their communications.
Mercury in 10th house – Mercury is in Cancer here. This shows a person can be working as health counselor as 12th house relates to hospitals, Virgo is sign of Healing and Cancer is sign of nourishing people. So, it is very much a health counselor. Its aspect on 4th house of home and home land shows that they want to serve people of their home land through their career. They also seek to have a very communicative environment at home.
Mercury in 11th house – Mercury is in Leo here. This shows someone in creative or imaginative writing. They can be very creative with their skills. This person can use his creativity to serve humanitarian causes. They will work towards making life comfortable for all. Its aspect on 5th house kind of confirms this as it shows someone using his education and creativity to help everyone. They can also be working in a large Govt Institution in field of communication. Like, someone in Govt Dept whose job is to reply to all letters and applications sent by people.
Mercury in 12th house – Here, Mercury will be exalted. They can be very health conscious. They will travel to Foreign Lands often. They can be in fitness related work and may like to heal and take care of people at hospitals. Its aspect on 6th house also confirms their role as a counselor to those who are facing obstacles and diseases/illnesses. They want to learn about diseases.
So, this is a basic idea of how Mercury's aspect will work in different houses for Libra Ascendant people. Communication, Counselling and Travelling will remain the main themes with Mercury.
Hope this helps. Please feel free to post comments and queries, if any.
Vishal S Saxena – Astrologer
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