Nakshatra's are 27 sections of the celestial sky that are located above the common 12 Zodiac constellations in astrology. They are also referred to as Lunar Mansions from historical texts. These sections of the sky are called "Nakshatras".
|11||Poorva Phalguni||Shukra (Venus)|
|12||Uttara Phalguni||Surya (Sun)|
Forthe purpose of Muhurta, the Brihat Samhita classifies the Nakshatras in some broad groups that characterize their nature. Each group is favorable for certain types of events, and these events give you a fairly good picture of the quality of that group:
Dhruva (fixed) Nakshatras - The three Uttaras and Rohini are called Dhruva or Fixed. To be used for coronations, expiatory rituals, planting of trees, laying the foundation of towns, commencement of meritorious deeds, sowing seeds and other permanent things.
Tikshna/Daruna (dreadful) - Mula, Ardra, Jyestha and Ashlesha. These are good for success in attacks, incantations, raising of goblins, imprisonment of others, murder, separation of friends and alliance with kings and the like. So if you care for raising a goblin, wait until the Moon is in one of those nakshatras.
Ugra (Fierce) - The three Purvas (Purvaphalguni, Purvasadha and Purvabhadrapada), Bharani and Magha. They are to be used with success in ruining enemies, destruction, deceit, imprisoning, poisoning, arson, striking with weapons and murders and the like.
Ksipra (Swift) - Hasta, Ashwini, and Pushya (Abhijit too) are termed Ksipra or Swift. They are beneficial for trade, sensual sports, education, decorations (or making ornaments), fine arts, skilled labor (like carpentry, smithy etc.), medical treatment, journey and the like (taking or giving loan etc.).
Mrdu (Tender) - Anuradha, Chitra, Revati and Mrigasira. They are used with advantage in making friends, sexual union, use of garments and ornaments, performance of auspicious ceremonies (like marriage, Upanayana and Cudakarana) and singing.
Mrdutikshna/ Sadharana (Tender-Dreadful) - Krittika and Vishaka. These yield mixed results.
Cara (Temporary) - Shrvana, Dhanistha, Shatabhisa, Punarvasu and Swati. These are beneficial for emphemoral things.
Since there is no one, complete authentic source on Nakshatras, we have to gather our information from several sources. The Brihat Samhita uses Nakshatras in various ways related to mundane astrology (part of the Samhita branch of Astrology). In the Brihat Jataka interpretations are given for the Moon in the various Nakshatras. Since the Moon rules the mind and emotions, the interpretations should be read as already being adjusted for the limitation of the Moon's significations. The full significance of the Nakshatra is greater than that.