Why in news?

• A two-day seminar and exhibition on the National Calendar of India has been scheduled on April 22-23, 2022 at Ujjain and Dongla, Madhya Pradesh (a place on the tropic of Cancer).
• Tropic of Cancer passes almost from the middle of India- covering eight states (from West to East) as: Gujarat, Rajasthan, Madhya Pradesh, Chhattisgarh, Jharkhand, West Bengal, Tripura and Mizoram.
• Mahi river cuts it twice, with Udaipur (in Tripura) as the major closest city and Agartala as the closest capital city.
• Other close capital cities include: Ranchi (Jharkhand), Aizawl (Mizoram), Bhopal (Madhya Pradesh), and Gandhi Nagar (Gujarat).