तिथी

विकिपीडिया, मुक्‍त ज्ञानकोशातून

In vedic timekeeping, a tithi (also spelled thithi) is a lunar day, or the time it takes for the longitudinal angle between the moon and the sun to increase by 12°. Tithis begin at varying times of day and vary in duration from approximately 19 to approximately 26 hours.

There are 30 tithis in each lunar month, named as follows:

क्रमांक कृष्ण पक्ष शुक्ल पक्ष Deity and properties
प्रतिपदा The presiding deity of the first lunar day in Brahma and is good for all types of auspicious and religious ceremonies
द्वितिया Vidhatr rules this lunar day and is good for the laying of foundations for buildings and other things of a permanent nature.
तृतिया Visnu is the lord of this day and is good for the cuttings of one's hair and nails and shaving.
चतुर्थी Yama is lord of the 4th lunar day, which is good for the destruction of one's enemies, the removal of obstacles, and acts of combat.
पंचमी The Moon rules this day, which is favourable for administering medicine, the purging of poisons, and surgery.
षष्ठी Karttikeya presides over this day and is favourable for coronations, meeting new friends, festivities, and enjoyment.
सप्तमी The 7th lunar day is ruled by Indra; one may begin a journey, buy conveyances, and deal with other such things as a movable nature.
अष्टमी The Vasus rule this day, which is good for taking up arms, building of one's defenses, and fortification.
नवमी The Serpent rules this day, with is suitable for killing enemies, acts of destruction, and violence.
१० दशमी The day is ruled by Dharma and is auspicious for acts of virtue, religious functions, spiritual practices, and other pious activities.
११ एकादशी Rudra rules this day; fasting, devotional activities, and remembrance of the Supreme Lord are very favourable.
१२ द्वादशी The Sun rules this day, which is auspicious for religious ceremonies the lighting of the sacred fire, and the performance of one's duties.
१३ त्रयोदशी The day is ruled by Cupid and is good for forming friendships, sensual pleasures, and festivities.
१४ चतुर्दशी Kali rules this day suitable for administering poison and calling of elementals and spirits.
१५ अमावस्या पौर्णिमा The Vasve-devas rule the New Moon suitable for the propitiation of the Manes and performance of austerities.

Ekadasi, the eleventh day of each lunar fortnight, has special religious significance in Hinduism and Jainism -- usually observed by fasting.

-- Indira Gandhi 12:22, 28 October 2005 (UTC)