Tushita Heaven; 兜率天;  Tibetan: དགའ་ལྡན (ganden); Wylie: dga' ldan; Sanskrit: Tusita;   Tushita Heaven, Joyous Realm is one of the celestial heavens of the Six Heavens or pure lands of the Desire Realm where gods and bodhisattvas reside and presided over by Maitreya. Nirmanakaya buddhas descend to take birth in the world from Tushita. Buddha Shakyamuni resided here as bodhisattva Shvetaketu. Before he leave for earth, Shakyamuni placed his crown on bodhisattva Maitreya's head. Maitreya will in turn takes birth as the future buddha. The beings of this world are 3,000 feet (910 m) tall and live for 4000 years or 576,000,000 human years (according to Sarvastivada tradition). The height of this world is 320 yojanas above the Earth. 兜率天、喜樂天，是欲界六欲天之第四天，320 由旬高，有內外兩院，外院是凡夫果報天宮，內院是淨土，菩薩修功圓滿，便下生人間成佛。釋迦牟尼佛未成佛前居住在內院，彌勒菩薩現居內院說法，故稱之為彌勒淨土。 兜率天人身量為1俱盧舍，以人間 400歲為一晝夜，定壽 4000歲，是人間 576,000,000年。