Step 1: Divisions of Jyotiṣa.
Jyotiṣa Śāstra (Vedic astrology) is divided into three main parts:
1. Hora Śāstra – predictive astrology.
2. Saṁhitā Śāstra – general and mundane astrology.
3. Siddhānta Śāstra – astronomical calculations.
Step 2: Checking the given options.
- Horaśāstra (1): Valid division.
- Saṁhitāśāstra (2): Valid division.
- Siddhāntaśāstra (3): Valid division.
- Akalanśāstra (4): Not part of Jyotiṣa divisions, hence incorrect.
Step 3: Conclusion.
Thus, the option not belonging to Jyotiṣa Bheda is Akalana Śāstra.