Sidereal yearA sidereal year (saɪˈdɪəri.əl, USalsosɪ-; ), also called a sidereal orbital period, is the time that Earth or another planetary body takes to orbit the Sun once with respect to the fixed stars. Hence, for Earth, it is also the time taken for the Sun to return to the same position relative to Earth with respect to the fixed stars after apparently travelling once around the ecliptic. It equals 365.256 363 004 ephemeris days for the J2000.0 epoch.
Gudi PadwaGudi Padwa is a spring festival marking the start of the traditional new year, primarily for Marathi and Konkani Hindus but for other Hindus as well. It is celebrated in and around Maharashtra, Goa, Madhya Pradesh and the union territories of Dadra and Nagar Haveli and Daman and Diu at the start of Chaitra, the first month of the lunisolar Hindu calendar. Padava or paadvo comes from the Sanskrit word pratipada, which is the first day of a lunar fortnight.
Babylonian calendarThe Babylonian calendar was a lunisolar calendar with years consisting of 12 lunar months, each beginning when a new crescent moon was first sighted low on the western horizon at sunset, plus an intercalary month inserted as needed by decree. The calendar is based on a Sumerian (Third Dynasty of Ur) predecessor preserved in the Umma calendar of Shulgi (c. 21st century BC). The year begins in spring, and is divided into 12 months. The word for "month" was arḫu (construct state araḫ).
Nanakshahi calendarThe Nanakshahi calendar (Punjabi: ਨਾਨਕਸ਼ਾਹੀ ਜੰਤਰੀ ) is a tropical solar calendar used in Sikhism. It is based on the "Barah Maha" (Twelve Months), a composition composed by the Sikh gurus reflecting the changes in nature conveyed in the twelve-month cycle of the year. The year begins with the month of Chet, with 1 Chet corresponding to 14 March. The reference epoch of the Nanakshahi calendar is the birth of Guru Nanak Dev, corresponding to the year 1469 CE. The Nanakshahi Calendar is named after the founder of the Sikh religion, Guru Nanak Dev Ji.
