Let’s look at important things here –
Mercury - Mercury represents communication skills, marketing, calculative ability, younger siblings, hobbies, skills with hands, intelligence, quick decision making, logical thinking, youthfulness etc.
Shatabhishak Nakshatra - It is a nakshatra related with healing and health care. It is related with serving humanity or higher cause. Please check this link for more info on Shatabhishak Nakshatra - https://www.astrosaxena.com/shatanaksh.
Aquarius - As Shatabhishak is part of Aquarius sign, Aquarius and things represented by Aquarius are also important here. Aquarius is 11th sign of zodiac belt, hence it signifies the things and energy related with 11th house of horoscope, such as Gains, Desires, Hopes and Wishes, Large Organisations, Network Circles etc. Besides this, Aquarius also represents Scientific Thinking & Research, Uplifting the Society, Higher Goals & Rewards for all. Aquarius is made of another set of 2 and half Nakshatra, i.e. Dhanishtha, Satabhisha and Purva-Bhadrapada. Aquarius Lord is Saturn & Rahu.
Saturn & Rahu - As Saturn rules Capricorn & Aquarius and Rahu co-rules Aquarius & also rules Shatabhishak, their position and dignity is important to know about the overall functioning of any planet in Shatabhisha/Aquarius.
Houses Involved – Also, we can’t afford to forget the houses involved as a planet can be ruling different houses and sitting in different house for every person as per ascendant and planet’s position. To know overall affect, we have to consider the houses involved as those areas of life are being impacted.
Interpretation of Mercury in Shatabhishak Nakshatra – Now, Mercury will be in friendly sign and Rahu's nakshatra. It is nakshatra closely connected with healing and healthcare. As Mercury remains a counselor, this position can easily make someone a counselor in medical field. Now, it can be anyone from a Doctor/Surgeon to a Pharmacist. They will be somewhere connected with work related with healing and medicines. As it is also a nakshatra of new age technology, Mercury there can make someone good at business related with technology related items and gadgets. They can also be seen as YouTubers or someone who regularly communicates through new-age technological means. But most commonly, they are seen as healers or counselors.
If Mercury is a relationship oriented planet in a chart then relationship can have its usual challenges as Aquarius is co-ruled by Saturn-Rahu. So, people need to adjust a lot to sustain their relationship.
Role of Saturn & Rahu - Also, Saturn-Rahu placement is important to guide Mercury in right direction, being Aquarius & Shatabhishak lords.
Other Factors – And of course, we need to consider conjunction, aspects, house lordship, house position and dashas etc to know the exact results of Mercury in Shatabhishak. So, we always need to take a holistic view of chart rather than just 1 planetary position.
Conclusion – So, this is how I see Mercury in Shatabhishak can work in a chart.
Hope this helps. Please post any comment or query you may have.
Swami Premanand Bharti