sentences:  Baháʼu'lláh, in the Kitáb-i-Aqdas, defines Naw-Rúz as the day on which the vernal equinox occurs.The exact timing of Naw-Rúz for Baháʼís worldwide depends on the choice of a particular spot on the Earth and was left to the Universal House of Justice, the governing body of the Baháʼís to decide.In 2014, the Universal House of Justice chose Tehran as the particular spot.