13 ensp 0183 ensp A circle is possibly the most complete shape possible It has no beginning and no end no corners or edges In many ways it is a complete universe in itself Perhaps that is why most celestial bodies are also circular Similarly quality at Oswal Valves is a full circle There is no beginning or end to our commitment to quality or to our quest to keep setting and breaking new benchmarks in 12 ensp 0183 ensp In their pursuit of accurate tracking of relative movements of celestial bodies for their calendar they had computed the mean diameter of earth which was very close to the actual 12 742 km 7 918 mi Hindu calendars were refined during the Gupta era astronomy by Āryabhaṭa and Varāhamihira in the 5th to 6th century