In 1935, Reza Shah requested the international community to refer to the country by its native name, ''Iran'', on Nowruz, falling on 21 March 1935; effective 22 March that year. Opposition to the name change led to the reversal of the decision in 1959, and Professor Ehsan Yarshater, editor of ''Encyclopædia Iranica'', propagated a move to use ''Persia'' and ''Iran'' interchangeably. Today, both ''Iran'' and ''Persia'' are used in cultural contexts, while ''Iran'' remains irreplaceable in official state contexts.