The basis of calendar unification or matla constitutes one of the most significant issues relating to the unification effort of Hijra calendar. The popular basis of unification, so far, is based on the union of regional and global matlaâ. The division of matlaâ to regional and global mat}laâ is now no longer accurate because it can not accommodate the Hijra calendar pooling ideas in the Islamic world. This paper discusses one of the leading International astronomy thought, Mohammad Shawkat Odeh on varieties of mat}laâ unification. He divided the principle of matla unification in to five forms: unification of global mat}laâ (one matlaâ for the whole world); the unity of matlaâ in the regions corresponding visibility of hilal; the unity of mat}laâ in a similar area of visibility of hilal; the unity of zonal/partial matlaâ; and the unity of local matlaâ. Odehâs thought on the various divisions of matla constitutes new thinking on the concept mat}laâ astronomical calculations. He also has presented more detailed thoughts on the division of mat}laâ rather than the others.
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