Indian history was divided into three different periods by British historians in the middle of the nineteenth century. The three periods were divided into “British”, “Muslim”, and “Hindu”. British Historians believed that there were no significant developments in terms of culture, society, and economy apart from the change in the religion of the rulers.
Such a division by the British historians has problems. Such a division ignores the diversity of the Indian subcontinent. The eleventh and eighth centuries were completely different from the sixteenth or eighteenth centuries.
Historians do not see time just as a calendar or clock showing years, days, or hours. The study of history becomes easier by dividing them into different periods or segments with similar characteristics. It reflects the similarities and changes in economic organisation, social changes, beliefs, and ideas.
Historical records exist in different languages, which keep changing considerably over time. For example, modern Persian is different from Medieval Persian. The differences are not just in vocabulary and grammar but also the meanings, which keep changing over time.
When Historians read texts, maps, and documents of the past, they have to be careful about the contexts and different historical backgrounds in which they were produced, as the cartography was different in two different periods.