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In the Kitáb-i-Aqdas, the Most Holy Book of His Revelation, Bahá'u'lláh confirmed the calendar the Báb had ordained and set His own seal upon Naw-Rúz — joining it forever to the close of the Fast, fixing it to the moment the sun enters the sign of Aries, and designating the new year of the spring equinox as a festival for all the people of the world.