Budhaditya yoga
Budhaditya yoga forms when the Sun and Mercury are in the same sign. The name combines Budha (Mercury) and Aditya (Sun). This site checks it in the birth chart.
What it is
The standard rule is the conjunction of the Sun and Mercury in one sign. The traditional readings associate it with intellect, learning and skill in speech.
How it is worked out or read
The rule does not depend on the house, only on the sign. Mercury's closeness to the Sun can weaken Mercury through combustion, a point covered in the combustion article.
Where it appears on this site
The result is in the birth chart. The combustion article explains the weakening.
Budhaditya in a family of Sun combinations
Budhaditya belongs to the Sun's family of combinations, which includes the Sun's relations with other planets. Reading it with the Sun's sign and house, and with the Sun's dignity, shows whether the bright and clear quality the yoga describes is supported by the rest of the chart. The Sun's own strength is the first thing a reader considers.
The rule
Budhaditya yoga forms when the Sun and Mercury are in the same sign. The name joins Aditya, the Sun, and Budha, Mercury. Because the rule depends only on the sign, the house does not matter for its formation, though the house and the other factors shape how it is expressed. This site checks the yoga in the birth chart by comparing the signs of the Sun and Mercury.
The yoga is one of the simplest combinations in the standard list, and it is often cited as a sign of learning and skill in speech. Its simplicity makes it easy to check by hand from the table of signs.
Mercury's closeness to the Sun
Mercury never moves far from the Sun, so when the two are in the same sign Mercury is usually close to the Sun in the sky. A Mercury this close may be combust, which the classical texts treat as weakening it. The reader should therefore consider whether the yoga's themes of intelligence are diminished by combustion, and should check the exact distance between the two when this matters.
The combustion article explains the orbs used in the classical rules. A reader can compare the distance with those orbs to see whether the Mercury is combust.
The traditional readings
Classical descriptions of Budhaditya are favourable in intellect, learning, the capacity for argument and skill in speech. The yoga is also associated with a clear and practical mind. These are traditional themes, and the reader should describe them as such, noting the other factors that shape them.
Using the yoga in a reading
Budhaditya is a useful example of how a simple rule should be read. The sign alone decides the yoga, but the reader then looks at the houses and the strength of the two grahas, and at whether Mercury is combust. The reading becomes more accurate when it moves from the rule to the context.
Budhaditya with other combinations
Budhaditya often appears with other combinations, such as the lordships that link Mercury's houses. A reader who finds Budhaditya should check whether Mercury's own sign or exaltation is also involved, since the combination of the sign and the yoga is read more strongly than the yoga alone.