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This occurs because of the complexity of the relative lunar, solar and earth movements. Underhill (1991) describes this part of Hindu calendar theory: "when the sun is in perigee, and a lunar month being at its longest, if the new moon immediately precedes a sankranti, then the first of the two lunar months is deleted (called nija or kshaya ...
A candra māna varṣa or lunar year is made up of 12 consecutive candramāsa. [5] These twelve candramāsa are designated by unique names caitra, vaiśākha, etc. [note 2] In some instances an additional candramāsa, known as an adhikamāsa, is added to synchronise the candra māna varṣa with the solar year or saura māna varṣa.
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°.
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]
In Vedic timekeeping, a māsa is a lunar month, a pakṣa is a lunar fortnight, and a tithi is a lunar day. There are two prevailing definitions of the lunar month: amānta, where the month ends with the new moon, and pūrṇimānta, where it ends with the full moon. Consequently, the same day may be associated with different but adjoining months.
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 .
The Tamil month that corresponds to Vaisakha is Chithirai (mid-April to mid-May). In the Hindu lunar calendar, Vaisakha begins with the new moon in April and represents the second month of the lunar year. The name of the month is derived from the position of the Moon near the Vishākhā constellation ("Nakshatra") on the full-moon day. [4]