Ayurveda emphasizes Swasthasya Swasthya Rakshanam—preserving the health of the healthy—through the disciplined observance of Dinacharya (daily regimen) and Ritucharya (seasonal regimen)1. The solar year is divided into two solstitial periods: Uttarayana (Northern Solstice, also called Adana Kala or the
Dr. Avijit Das (Fri,) studied this question.