Step 1: Understanding the Concept:
Every cardinal direction is associated with a specific planet that acts as its guardian or lord. This assignment is used in Vāstu Śāstra, during travels (Prasthāna), and to determine the 'Digbala' (Directional Strength) of a planet in a horoscope. For example, a planet is strongest when it is placed in the house corresponding to its direction.
Step 2: Detailed Explanation:
The standard directional planetary lordships are as follows:
1. East (Pūrva): The Sun (Sūrya) is the lord of the East. The Sun rises in the East, bringing light and life. In a horoscope, the 1st house (Ascendant) represents the East. Jupiter and Mercury also gain directional strength here, but the Sun is the primary sovereign of this direction. (A-III)
2. South (Dakṣiṇa): Mars (Maṅgala) is the lord of the South. The South represents fire and vigor. In a horoscope, the 10th house (Mid-heaven) corresponds to the South. The Sun also gains strength here, but Mars is the specific directional ruler. (B-II)
3. West (Paścima): Saturn (Śani) is the lord of the West. The West represents darkness, sunset, and the end of the day, which matches Saturn's cold and dark nature. In a horoscope, the 7th house corresponds to the West. Saturn is at its strongest (full Digbala) in the 7th house. (C-IV)
4. North (Uttara): Mercury (Budha) is the lord of the North. The North is associated with wealth and commerce (Kuber). In a horoscope, the 4th house (Nadir) corresponds to the North. Mercury and Jupiter are considered to have directional strength in the Northern/Nadir direction. (D-I)
Matching these according to the lists:
- East (A) \(\rightarrow\) Sun (III)
- South (B) \(\rightarrow\) Mars (II)
- West (C) \(\rightarrow\) Saturn (IV)
- North (D) \(\rightarrow\) Mercury (I)
This mapping is essential for the 'Aṣṭadikpāla' ritual and for Vāstu designs, where the placement of elements (like fire in the Southeast/Agni or water in the Northeast/Ishan) depends on these planetary influences.
Step 3: Final Answer:
The correct match is A-III, B-II, C-IV, D-I.