Sri Kalahasti Shiva Temple is the only temple which remains open during Solar Eclipse or Lunar Eclipse. Every temple in the area where the Surya Grahanam or Chandra Grahanam takes place or show its effect remains closed. But, because of the association with Rahu and Ketu (two prominent Grahams in Hindu Jyotishyam) the temple remains closed at the time of Grahans.
During Grahan time, devotees offer Abhishekam to Rahu and Ketu in Kalahasti Temple to pacify the two celestial Gods of Hindu Astrology. Various Shanti pujas and Japas are performed during the Grahan at Sri Kalahasti temple.