Where the crescent of Ramadan is not sighted on the 29th day of Shaaban, the month would be deemed to have naturally completed its circle on the 30th day in which case Ramadan fast automatically begins the following day, which would be the 1st day of Ramadan.
For place wey di cresent of Ramadan no dey sighted on the 29th day of Shaaban, di month go count say im don complete im circle of 30th day where Ramadan fast automatically start di next day, wey go be 1st of Ramadan.