Bhopal/ Hyderabad/Raipur/ Vishakhapatnam/ Lucknow, Jan 26 (ANI): Indian states on Monday observed 66th Republic Day. Madhya Pradesh witnessed the parade by the police force as the state governor Ram Naresh Yadav saluted the force and greeted them on the Republic day. Uttar Pradesh being the largest Indian state witnessed various tableaux showcasing the culture and rich heritage and also the parade by the police personnel along with flypast. Meanwhile, a ceremonial parade was also held at the Eastern Naval Command parade ground in Vishakhapatnam. Vice Admiral Satish Soni, Flag Officer Commanding-in-Chief, Eastern Naval Command, took the salute. Andhra Pradesh Governor ESL Narasimhan also addressed the state on the occasion and saluted the police force. Chhattisgarh Governor Balram Das Tandon also saluted the parade and hoisted the national flag in Raipur. Republic Day honours the date on which the Constitution of India came into force on 26 January 1950 replacing the Government of India Act (1935) as the governing document of India. Earlier in the day, the national capital hosted the ceremonial parade with US President Barack Obama as the chief guest.