Tsukuyomi no Mikoto, often referred to simply as Tsukuyomi, is the god who reigns over the night and moon, born from Izanagi when he purified his right eye of the filth of Yomi, thus making him the brother of Amaterasu, and Susano-o. There are not many stories who involves or mention Tsukuyomi, making him very mysterious and enigmatic to the point that the deity's gender has been brought into question, though they are largely accepted to be male.
He was asked by his sister to act as a representative of hers at a feast hosted by the god Ukemochi. After eating he happened upon Ukemochi producing food from every orifice in their body, Tsukuyomi felt both disgusted and disrespected that he killed her in a fit of rage. When Amaterasu learn of his actions, she was infuriated not only by the murder but the disrespectful conduct of Tsukuyomi as her representative, banishing him so that they would never meet again, thus making day and night appearing at different time and were never seen together.
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The moon god from Japanese mythology. Tsukuyomi was said to have been born from the right eye of Izanagi during purification after his escape from Yomi no kuni, the underworld. Tsukuyomi was the second of the "three noble children," who was commanded by his father Izanagi to watch over the night sky. In the Chronicles of Japan, Tsukuyomi and his sister the sun goddess Amaterasu part ways due to their disagreements. This is why the sun and moon appear at different times in the sky.