for Astronomy and Astrophysics. During the period of 1973–1981 he was a member of the Indian National Committee for Astronomy. Radhakrishnan was selected to various scientific bodies, both national and international. He was a Foreign Fellow of both the Royal Swedish Academy of Sciences and the U.S. National Science Academy. He was an Associate of the Royal Astronomical Society and a Fellow of the Indian Academy of Sciences, Bangalore. Areas of research Radhakrishnan had been associated with the field of radio astronomy practically from the beginning of its phenomenal post-World War II growth in the 1950s. He was one of the persons who founded the science of observational astronomy in India. His career had been truly international, starting in Sweden in 1954 and proceeding via Caltech and CSIRO, Sydney to Bangalore, where he spent the last thirty three years. Starting with the electronics of receivers, he moved on to technically innovative and astronomically far-reaching studies of the polarization of the radio waves. These include the detection of radio waves from the Van Allen like belts surrounding Jupiter and the first determination of the true rotation of the core of Jupiter. He was also the first in systematic application of interferometry to polarized brightness distributions and an early study of the Zeeman Effect in the 21 cm line emitted by a hydrogen atom. His measurements of polarization of Vela Pulsar were decisive in establishing the picture of a magnetized rotating neutron star and led him to propose the paradigm of curvature radiation from polar caps of neutron stars which has dominated the subject of pulsar emission mechanisms since that time. The period of his stay in Australia also marked his leadership of an extensive survey of the absorption and emission of 21cm line radiation by neutral hydrogen which later helped to develop the realistic model of the interstellar medium. He also carried out systematic interferometric study of 21cm absorption towards a large number of galactic and extragalactic sources. He also contributed in designing and fabricating hang-gliders, micro-light aircraft and sailboats. His original contributions in these fields were acknowledged by the Government of India by way of support from the Aeronautics Research Development Board, Ministry of Defence (for designing hang-gliders) and ISRO (for sailboats). Publications Radhakrishnan published more than 80 papers in research journals and also proceedings of different various International Conferences . Radhakrishnan also co-edited a book of conference-proceedings, "Supernovae: their