2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/15019The 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.3 pages tex files including figuresAstrophysicstext