While the Gregorian calendar was adopted by the individuals of Britain, the National Calendar was adopted by the Maharajas of India. To put an end to his fixation with astrology, he produced a brand-new calendar by using the very same calendar, the solar calendar. The creation of the National Calendar marked the shift from the conventional solar Reckoning to the more regular National Calendars.
Unlike the lunatic/solar calendar, which is adopted by practically all nations, the National Calendar is largely based on the astronomical calendar and does not follow the lunar calendar. The National Calendar’s most widely utilized part, the moon, is not included in the computation of the calendar year on which the beginning and end of each month are computed.
Image Sources : elmoredelphia.blogspot.com