(a)Roughly corresponds to 180th meridian, the regions to the east of which are counted as being one day earlier in their calendar dates than regions to the west
(b)Roughly corresponds to 1 80fh meridian, the region to the west of which are counted as being one day earlier in their calendar dates than regions to the east
(c)Roughly corresponds to 90th meridian which falls on the opposite side of the Greenwich meridian
(d)Roughly corresponds to 135th meridian which falls on the opposite side of the Greenwich meridian
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