This occurs because of the complexity of the relative lunar, solar and earth movements. See below the changes in each version:. Those Hindu calendars which are based on lunar cycle are generally phonetic variants of each other, while the solar cycle are generally variants of each other too, suggesting that the timekeeping knowledge travelled widely across the Indian subcontinent in ancient times. During the 9th century, epigraphical artwork began using Vikram Samvat suggesting that the Hindu calendar era in use became popular as Vikram Samvat ; Buddhist and Jain epigraphy continued to use an era based on the Buddha or the Mahavira. Culture Documents.
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