Nakshatra Cluster · Ruling Planet

Mercury-ruled nakshatras, the 17-year group.

Mercury rules three of the 27 nakshatras: Ashlesha, Jyestha, Revati. All three share the 17-year Mercury major period when the natal Moon falls inside them. The macro signature: subtlety, completion, communication. Mercury-ruled nakshatras carry the register of intelligence and finishing.

The three nakshatras in the group

Nakshatra	Deity	Range	Symbol
Ashlesha	Nagas	16°40' to 30°00' Cancer	serpent
Jyestha	Indra	16°40' to 30°00' Scorpio	earring or umbrella
Revati	Pushan	16°40' to 30°00' Pisces	fish or drum

What Mercury's ruling register means

Subtlety, completion, communication. mercury-ruled nakshatras carry the register of intelligence and finishing. Mercury-ruled nakshatras inherit this signature at the broad level, then split into three distinct readings by sign placement, presiding deity, and pada structure. The shared element is the 17-year major-period length and the underlying ruling-planet character.

How the three members differ

Ashlesha

Ashlesha sits at 16°40' to 30°00' Cancer with deity Nagas and symbol the serpent. The macro register is subtle, penetrating. Read the full deep-dive at Ashlesha nakshatra.

Jyestha

Jyestha sits at 16°40' to 30°00' Scorpio with deity Indra and symbol the earring or umbrella. The macro register is senior, protective. Read the full deep-dive at Jyestha nakshatra.

Revati

Revati sits at 16°40' to 30°00' Pisces with deity Pushan and symbol the fish or drum. The macro register is completing, nourishing. Read the full deep-dive at Revati nakshatra.

What the major period looks like

When the natal Moon falls in any of the three Mercury-ruled nakshatras, the native opens life in the Mercury major period. The 17-year window foregrounds Mercury's karaka register. The nakshatra-specific reading further qualifies the period through the presiding deity and sign placement of the natal Moon.

The Vimshottari sub-period sequence inside the Mercury major period runs through all 9 planets in proportion to their major-period lengths. Each sub-period activates a different karaka combination. The full sub-period structure is covered in the Mercury major-period overview.

What the framework does not predict

The cluster reads structural patterns at the national-chart level and at the cohort level. Group membership does not generate forward calls automatically. Calibration is by chart and signature class. The framework is explicit about this scope limit.

FAQ

How long is the Mercury major period in the Vimshottari sequence?

The Mercury major period runs 17 years. It activates when the natal Moon falls in any of the three Mercury-ruled nakshatras: Ashlesha, Jyestha, Revati. The exact degree of the Moon within the nakshatra fixes how much of the Mercury major period remains at birth.

What is the macro signature of the Mercury-ruled group?

Subtlety, completion, communication. mercury-ruled nakshatras carry the register of intelligence and finishing. The three nakshatras differ in deity, sign placement, and pada structure, but share the Mercury major-period length and the broad ruling-planet register.

How do the three Mercury-ruled nakshatras differ?

At the macro level all three carry Mercury's register, but each picks up the qualities of its sign placement and presiding deity. Ashlesha (16°40' to 30°00' Cancer, Nagas) reads as subtle, penetrating. Jyestha (16°40' to 30°00' Scorpio, Indra) reads as senior, protective. Revati (16°40' to 30°00' Pisces, Pushan) reads as completing, nourishing.

Does this group share a major-period firing pattern on the corpus?

The three nakshatras share the Mercury major-period length but do not share calibrated forward-call windows automatically. Calibration is by chart and signature class, not by nakshatra group. Individual nakshatra deep-dives carry the calibrated context where it exists.

Where does the Mercury-ruled group sit in the 120-year cycle?

In the standard Vimshottari sequence the major-period order is Sun, Moon, Mars, Rahu, Jupiter, Saturn, Mercury, Ketu, Venus, then repeating. The Mercury major period therefore enters the sequence whenever the previous major period closes; the entry point on a personal chart depends entirely on the natal Moon nakshatra and degree.