The width of the umbral shadow of the moon durinf TSE is prominantly determined by the use of the value of a parameter known as'k' the ratio of the moon's diameter and earth's equatorial radius. Over the past one decade it has brought into a lot of confusion for the prediction of the umbral width due to prefential use of value of k, one being as adopted by IAU and the other continuing the prefential tradition, Because the diatnce between earth and moon and earth and sun are very accurately known there should not be any major controversy over the value of k. Indirectly it implies a variation in the adopted value of solar radius. In this particular instance we planned for determning the umbral boundaries of the lunar shadow over the longitude 76° E. The difference between the predictions by NASA and USNO has been as wide as 43.9 Km. Our actual measurment suggests it to be about 800 m smaller than the predicted value as given by USNO. This suggests a change in radius of sun, ofcourse at the epoch of the event of the eclipse substaintially larger than the one recommended by IAU. The experiment and the results will be discussed.