According to the Hindu period calculation, the time it takes for the ‘lunar longitude’ to move 12 degrees above the ‘sun line’ is called the date. There are thirty dates in a month and these dates are divided into two sides. The last date of Shukla Paksha is called Purnima and the last date of Krishna Paksha is Amavasya. Date names – Pratipada, Dwitiya, Tritiya, Chaturthi, Panchami, Shashthi, Saptami, Ashtami, Navami, Dashami, Ekadashi, Dwadashi, Trayodashi, Chaturvadashi, Amavasya / Poornima.
Star: A star cluster in the sky is called a constellation. It consists of 27 Nakshatras and nine planets are owned by these Nakshatras. Names of 27 Nakshatras – Ashwin Nakshatra, Bharani Nakshatra, Kritika Nakshatra, Rohini Nakshatra, Mrigashira Nakshatra, Ardra Nakshatra, Punavasu Nakshatra, Pushya Nakshatra, Ashlesha Nakshatra, Magha Nakshatra, Purva Palguni Nakshatra, Uttaraphalguni Nakshatra, Hastra Nakshatra, Hasta Nakshatra, Hasta Nakshatra, Hasta Nakshatra Visakha Nakshatra, Anuradha Nakshatra, Jyestha Nakshatra, Moola Nakshatra, Purvashada Nakshatra, Uttarashadha Nakshatra, Shravan Nakshatra, Gambha Nakshatra, Shatabhisha Nakshatra, Poorvabhadrapada Nakshatra, Uttarabhadrapada Nakshatra, Revathi Nakshatra.
War: War means day. There are seven heads in a week. These are named after the seven warren planets – Monday, Tuesday, Wednesday, Thursday, Friday, Saturday, Sunday.
Yoga: Like the constellation, there are 27 types of yoga. The positions of the particular distances of the Sun and Moon are called Yogas. Names of 27 yogas formed on the basis of distance , Siddha, Sadhya, Shubh, Shukla, Brahma, Indra and Validity.
Karan: There are two Karanas in a date. In the first half of a date and in the latter part of a date. There are a total of 11 Karanas whose names are as follows – Bava, Balava, Kaulava, Taitil, Gar, Vanij, Vishti, Shakuni, Chatushpad, Nag and Kistughan. Vishti Karan is called Bhadra and auspicious work in Bhadra is considered taboo.