Bharatanatyam traces its origins to the Natya Shastra written by Bharata Muni (c. 400 BCE - 200 BCE), a Hindu sage. In ancient times it was performed as dasiattam by temple Devadasis. Many of the ancient sculptures in Hindu temples are based on Bharata Natyam dance postures karanas. In fact, it is the celestial dancers, apsaras, who are depicted in many scriptures dancing the heavenly version of what is known on earth as Bharatanatyam. In the most essential sense, a Hindu deity is a 
revered royal guest in his temple/abode, to be offered a standard set of religious services called Sodasa Upacharas ("sixteen hospitalities") among which are music and dance, pleasing to the senses. Thus, many Hindu temples traditionally maintained complements of trained musicians and dancers, as did Indian rulers.Bharata Natyam as a dance form and carnatic music set to it are deeply grounded in Bhakti. Bharata Natyam, it is said, is the embodiment of music in visual form, a ceremony, and an act of devotion. Dance and music are inseparable forms; only with Sangeetam (words or syllables set to raga or melody) can dance be conceptualized.
Bharatanatyam technique includes many other elements, such as elaborate neck and eye movements. While Natya Shastra contains the largest number of the movements, and the most detailed descriptions, Abhinaya Darpanam, for instance, has defined only 9 head movements, 4 neck movement and 8 eye movements (compared with 36 of Natya Shastra) which are used extensively th
roughout the dance.Head Movements (Shiro bhedas): Sama, Udhvahita, Adhomukha, Alolita,Dhutam, Kampitam, Paravruttam, Utkshiptam and Parivahitam.
Neck Movements (Griva bhedas): Sundari, Tirashchina, Parivartita, Prakampita
Eye Movements (Drishti bhedas): Sama, Alolita, Sachi, Pralokita, Nimilite, Ullokita,Anuvritta, Avalokita