They were administered the oath of office by Chief Justice P. Sathasivam.
With their appointment, the strength of the apex court judges has gone up to 30. It is still one short of its sanctioned strength of 31.
Both were Chief Justices in different High Courts
Before being elevated to the apex court, Justice Nagappan was the chief justice of the Orissa High Court and Justice Shiva Kirti Singh was the chief justice of the Allahabad High Court.
Justice Nagappan hails from Tamil Nadu and Justice Shiva Kirti Singh is from Bihar.
With Justice Nagappan taking oath on Thursday, the number of judges from Tamil Nadu have gone up to three -- including Chief Justice P. Sathasivam and Justice Fakir Mohamed Ibrahim Kalifulla.
With Justice Shiva Kirti Singh joining, the number of apex court judges from Bihar has gone up to three. The other two are Justice C.K. Prasad and Justice Gyan Sudha Misra.