Moolavar
Mulavar or Mula-murti is a Sanskrit-Tamil term referring to the main deity, or a murti in a Hindu temple.Location
The central deity, mulavar, is located near the centre of temples, than the images that surround them, and are precisely located at the points corresponding to the energies they represent on the temple plan's power diagram. During the Kumbabhishekam or the coronation event, the temple is renovated, while the mulavar image is moved to a temporary location. The practice is called Balalayam, during which a temporary image is housed in the sanctum.Sanctum
is a Sanskrit word referring to the interior of the sanctum sanctorum, the innermost sanctum of a Hindu temple, where resides the murti of the primary deity of the temple. The sanctum is located at the centre of the temple, and its only opening mostly faces east. Only the pujari are allowed to enter the sanctum. The mulavar is usually made of stone images in most South Indian temples. In some temples, it is made of limestone or wood. In Shiva temples, the mulavar vigraha is usually a lingam, while in all other temples, the sculpted image of the respective deities are sported with their weapons in different positions based on the legend associated with the temple. In large temples, more than one image is housed inside the sanctum. Some of the temples like the ones in the 108 Divya Desams, the 12 Jyotirlingas, the Panchabhoota temples, the 51 Shakti Peethas are all believed to be self-manifested and made out of mostly black stone.Religious practices
The temple priests perform the puja during festivals and on a daily basis. The temple rituals are performed five times a day; Ushathkalam at 6:00 a.m., Kalasanthi at 9:00 a.m., Uchikalam at 1:00 p.m., Sayarakshai at 5:00 p.m., and Ardha Jamam at 9:00 p.m. Each ritual comprises four steps: abhisheka, alangaram, neivethanam, and deepa aradanai for the presiding deities in the temple. The worship is held amidst music with nadasvaram and tavil, religious instructions in the Vedas read by priests, and prostration by worshippers in front of the temple mast. There are weekly rituals like somavaram and sukravaram, fortnightly rituals like pradosham, and monthly festivals like amavasya, kiruthigai, pournami, and sathurthi when ablution and special poojas are performed on the mulavar. The ablution on the mulavar deity is performed in a sequence with various material like milk, curd, honey, and sugar. These are meant to indicate five elemental aspects of earth and with the ablution, prayers are sought to please the five natural elements.