Night time variation of Fried's parameter at VBT, Kavalur

The night time variation of the Fried’s parameter, r${}_o$ is measured on 28-29 March 1991, at the Cassegrain focus of 2.34 m Vainu Bappu Telescope (VBT), at Vainu Bappu Observatory (VBO), Kavalur, India, using speckle interferometer; the results are discussed.