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The Hindu calendar is based on a geocentric model of the Solar System. [1] A geocentric model describes the Solar System as seen by an observer on the surface of the Earth. The Hindu calendar defines nine measures of time (Sanskrit: मान IAST: māna): [2] brāhma māna; divya māna; pitraya māna; prājāpatya māna; guror māna; saura ...
The Hindu texts used the lunar cycle for setting months and days, but the solar cycle to set the complete year. This system is similar to the Jewish and Babylonian ancient calendars, creating the same challenge of accounting for the mismatch between the nearly 354 lunar days in twelve months, versus over 365 solar days in a year.
The traditional lunar calendar system measures time based on the Moon's phases and its relation to the Sun. Unlike solar calendars, it uses units such as tithi (lunar day), pakṣa (lunar fortnight), māsa (lunar month), ṛitu (season), ayanam (half-year), and varsha (lunar year) to structure the year. [17]
An extra month, or adhika-masa falls every 32.5 months on an average. The solar year is made up of 365 days and about 6 hours, and the lunar year is made up of 354 days. This causes a gap of 11 days, 1 hour, 31 minutes and 12 seconds between the lunar and the solar years. As this gap accumulates each year, it approximates in 2.7 years to one month.
The astronomical basis of the Hindu lunar day. In Vedic timekeeping, a tithi is a "duration of two faces of moon that is observed from earth", known as milа̄lyа̄ (Newar: 𑐩𑐶𑐮𑐵𑐮𑑂𑐫𑐵𑑅, मिलाल्याः) in Nepal Bhasa, [1] or the time it takes for the longitudinal angle between the Moon and the Sun to increase by 12°.
Tithi or Lunar day is an important concept in Hindu astrology. It means lunation. It means lunation. There are thirty tithis in a Lunar month distributed in the 360 degrees of the Zodiac and each tithi is completed when the longitude of the Moon gains exactly twelve degrees or its multiple on that of the Sun.
In Indian astronomy, a karaṇa is a half of a tithi. It is the duration of time in which the difference of the longitudes of the Sun and the Moon is increased by 6 degrees. [1] [2] A lunar month has 30 tithi-s and so the number of karaṇa-s in a lunar month is 60. These sixty karaṇa-s are not individually named.
Paksha (Sanskrit: पक्ष, romanized: pakṣa) refers to a fortnight or a lunar phase in a month of the Hindu lunar calendar. [1] [2] Literally meaning "side", [3] a paksha is the period either side of the purnima (full moon day). A lunar month in the Hindu calendar has two fortnights, and begins with the purnima .