Oceanic eddies are also usually made of water masses that are different from those outside the eddy. That is, the water within an eddy usually has different temperature and salinity characteristics to the water outside the eddy. There is a direct link between the water mass properties of an eddy and its rotation.
It changed its name to Free, Sovereign and Independent Republic of Sri Lanka in 1968 and finally to its current name Democratic Socialist Republic of Sri Lanka in 1972. February 4 each year is celebrated as a national holiday in Sri Lanka.
Finally, when the country adopted the local name of Sri Lanka in 1972, the flag was modified once more, with four leaves of the pipul tree, a Buddhist symbol, added to the four corners of the dark red panel. This version of the flag was in official use from 1978.