The city of Allahabad was originally known as Prayag in ancient times. The Union Home Ministry has approved the proposal of the Uttar Pradesh Government to rename Allahabad as Prayagraj. Akbar’s grandson Shah Jahan renamed the entire city as Allahabad.
The Thermal concept of the origin of monsoon was given by noted astronomer Halley. But there were some faults. Halley overlooked the Coriolis effect and the concept of the passing of latent heat through water vapour.