You can watch Thirunallar Shani Peyarchi Vizha on 19 December 2017 live online through the live streaming of Tamil Television channels and some Telugu TV channels. Doordarshan DD Podhigai and Jaya TV will telecast the Shani Transit Puja live.
Bhakti TV (Telugu devotional channel) will broadcast it live and you can watch it live online through Bhakti TV live streaming.
Sani Peyarchi is transition of Saturn from Vrischika Rashi to Dhanu Rashi (Scorpio to Sagittarius). It is happening in the morning on December 19, 2017 according to the Thirunallar Temple.
Thirunallar Shani Temple is the most famous Shani Bhagawan temple in Tamil Nadu and even in South India.
Dinamalar TV, Sri Sankara TV and Vasant TV are other popular channels to watch Thirunallar Shani Peyarchi Vizha live.