Change in Nature due to passing of time is normal. The form of change is the Sunrise and the Sunset. The day starts with the sunrise and ends with the sunset. The start of night also starts with the sunset. The change in Nature is possible only due to sunrise and the sunset. The combination of the date, day, nakshatra, yaag and karan with the sunrise is called panchanga or the daily Hindi calendar. The day – night, fortnight – month, seasons and the other thoughts and all the changes that take place in nature are visible in the Panchanga. That is, the co-ordination of the Universe takes place with the Sunrise and the Sunset.