The first one of Mercury through Nakshatras, i.e. Mercury in Ashwini Nakshatra.
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.
Ashwini – Ashwini is 1st nakshatra, so it comes with the nature of pro-activeness and be first everytime. It is also nakshatra of Healers or Doctors as its deity is Ashwini Kumars, the metaphysical healers. It is also nakshatra of illusion, cheating and confusion. For more info on Ashwini, please check this - https://www.astrosaxena.com/ashnaksh.
Aries – As Ashwini is part of Aries, Aries sign and its representations become important here. Aries is the 1st sign of zodiac belt, so it represents the things and energy of 1st house of horoscope like Self, Personality etc. Besides that, Aries is the sign of our individuality, our aggression, our actions, our competitive ability etc. Aries is ruled by Mars and it is consisted of 2 and half Nakshatras named Ashwini, Bharani and Krittika.
Mars – As Mars rules Aries, Mars’ position and dignity is important to know about the overall functioning of any planet in Aries.
Ketu – Likewise as Ketu rules Ashwini, Ketu’s position and dignity is important to know about the overall functioning of any planet in Ashwini
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 Ashwini Nakshatra – When Mercury is in Ashwini, 1st of all it is losing its dignity as it is in great enemy sign of Mars. Then there will be an energy exchange between things related to Mercury and Ashwini. It means that this person can be interested in travelling as a hobby or he can be in travelling related career. They can be a sprinter too. At the same time, they should be careful against negligent driving. It also means that person is interested in collecting information about metaphysical things. They can be very curious and research oriented. They can have special interest towards animals. They can be counselors or business people in metaphysical or healing related things. Their siblings can also have all these traits. They need to be specially careful about their speech and communication as they may say a few things without being aware of situation and circumstances and later they may have to regret over those things. Overall, a good position for gaining knowledge through research but can be troublesome position if person is negligent in communication.
Role of Mars – Mars's placement is important to guide Mercury in right direction, being Aries's lord..
Role of Ketu - Likewise, Ketu's placement is important to guide Mercury in right direction, being Ashwini's lord.
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 Ashwini.
Conclusion – So, this is how I see Mercury in Ashwini can work in a chart.
Hope this helps. Thanks,