Budha-Aditya

Budha-Aditya Yoga is formed by the conjunction of Budha, Mercury, with Aditya, the Sun, in the same sign. It is read for intelligence, learning, skill in speech and administrative capacity. The combination is extremely common for a straightforward astronomical reason: Mercury never appears more than about twenty-eight degrees from the Sun, so it is in the same sign as the Sun in a large proportion of all charts, and in an adjacent sign otherwise. That frequency is itself a caution about how such combinations should be weighted. The classical qualification here concerns combustion, astangata: a planet too close to the Sun is held to be burnt and weakened, so a Mercury within a few degrees of the Sun may be read as damaged rather than strengthened, and different authorities give different orbs for the effect.

Classical texts do not agree on a single combustion orb: figures commonly cited for Mercury range from about eleven to fourteen degrees of separation from the Sun, narrower still, to roughly thirteen degrees, when Mercury is retrograde, and different authorities apply the rule with different strictness. A further complication is that some later commentators distinguish ordinary combustion from a very close conjunction, within about a degree, which a minority of texts treat as exceptionally intensifying rather than damaging, on the reasoning that a planet all but fused with the Sun shares its light rather than being merely scorched by it; this reading is a minority position not shared by most classical authorities. Because the yoga's strength also depends on Mercury being otherwise undamaged, exaltation in Virgo raises its promised effect above the bare conjunction.

Budha-Aditya has a structural difficulty built into it that the classical literature acknowledges and modern practice frequently ignores. The combination requires Mercury and the Sun in the same sign, and Mercury never travels more than about twenty eight degrees from the Sun. It is therefore in the Sun's sign or the one adjacent for a large part of every year, and conjunctions are ordinary rather than rare.

The difficulty is that jyotisha also holds a planet too near the Sun to be combust, asta, its significations burnt away by proximity. The usual figure given for Mercury is a range of a few degrees, with different authorities setting the boundary differently and some treating Mercury as less vulnerable than the other planets because of its natural closeness. So the same conjunction that constitutes the yoga can, if too exact, be the condition that spoils it.

Practitioners resolve this in different ways and they do not agree. Some require a minimum separation before crediting the combination. Some hold that Mercury is exempt. Some treat the yoga as operating on the intellect regardless, on the argument that a burnt Mercury is still a Mercury with the Sun.

The atlas records the disagreement rather than picking a side, because the sources genuinely differ. Nothing here is a claim that any of it predicts anything.