How is Vasumathi (Vasumati) yoga formed in a horoscope? What are its effects?
When benefics occupy upachaya houses(3rd house, 6th house, 10th house, and 11th house) either from ascendant or from the moon then Vasumathi yoga is formed. The Vedic text mentions that a person born with Vasumathi yoga will have sound wealth throughout life.
Upachaya houses
The upachaya houses are given more importance in Vedic astrology. The malefic planets in the horoscope when occupies upachaya house are generally considered good and with this, we can quite easily understand that benefics occupying Upachaya houses are considered Raja yoga.
Benefics
In astrology following planets are considered benefics,
Jupiter Mercury Venus Waxing Moon Source: Brihat parashara hora Shastra
All these benefics occupying upachaya(3rd house, 6th house, 10th house, and 11th house) is a very rare combination, but if happens then it would create powerful Vasumati yoga
Strength of the Yoga
Strength of the yoga depends on the number of benefics occupying upachaya houses. For example, 3 planets occupying upachaya will be less strong than 4 planets occupying upachaya but it is powerful than 2 planets occupying upachaya houses.
When considering from the Moon, the maximum number of benefic planet that can occupy upachaya is only 3 as Moon is already left out.
Even if one or two benefics occupying upachaya house can create moderate yoga, but if that planet gets exalted or aspected by benefic then it will give considerable results.
Overall conclusion
While accessing any yoga, the overall strength of the yoga should be thoroughly studied before the conclusion. For example, if 2 benefic planets exalted in the upachaya houses(possible only for Taurus ascendant and Libra ascendant when Jupiter and Venus exalted) but if the 2nd lord is extremely weak and conjoined with 12th house then it may not give lasting wealth.