Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Pages: 26. Chapters: Hindu calendar, Tamil calendar, Vasanta, Hindu units of measurement, Gaurabda, Vikram Samvat, Indian Standard Time, Indian national calendar, Tithi, Date and time notation in India, Shukla paksha, Ritu, Shalivahana era, Amavasya, Chaturthi, Panchami, Time and Frequency Standards Laboratory, Purshottam maas, Rtu, Calcutta time, Navami, Port Blair mean time, Shashti, Madras time, Chaturdashi, Sharad, Saptami, Ashtami, Sashtiabdhapoorthi, Shishir, Shishira, Dvadasi, Asia/Kolkata, Sravanam, Grishma. Excerpt: The Hindu calendar used in ancient times has undergone many changes in the process of regionalization, and today there are several regional Indian calendars, as well as an Indian national calendar. Most of these calendars are inherited from a system first enunciated in Vedanga Jyotisha of Lagadha, a late BCE adjunct to the Vedas, standardized in the Surya Siddhanta (3rd century CE) and subsequently reformed by astronomers such as Aryabhata (499 CE), Varahamihira (6th c. CE), and Bhaskara (12th c. CE). Differences and regional variations abound in these computations, but the following is a general overview of Hindu lunisolar calendar. In the Hindu calendar, the day starts with local sunrise. It is allotted five "properties," called angas. They are: Together these are called the panch ngas (Sanskrit: pancha = five). An explanation of the terms follows. Vaasara refers to the days of the week and bear striking similarities with the names of the week in many western cultures: The term -vaasara is often abbreviated as vaara or vaar in Sanskrit-derived languages. There are many variations of the names in the regional languages, mostly using alternate names of the celestial bodies involved. The ecliptic is divided into 27 nakshatras, which are variously called lunar houses or asterisms. These reflect the moon's cycle agains...