A Karana is exactly half a Tithi (6° Sun-Moon angular arc, ~10-13 hours). A 30-Tithi lunar month produces 60 Karanas generated by 11 unique Karanas: 7 Movable (Chara) revolving 8 times + 4 Fixed (Sthira) anchoring Amavasya.
Understanding Bhadra Vaas (भद्रा वास) • Muhurta Chintamani & Parashara Shastra
Among all 11 Karanas, Vishti (popularly known as Bhadra) holds the most formidable position in Electional Astrology (Muhurta Shastra). As the daughter of Surya and sister of Shani (Saturn), Bhadra possesses intensely fiery, restrictive, and aggressive energy. Classical texts declare that auspicious deeds commenced during Bhadra result in obstacles and distress. However, Bhadra does not always direct her wrath towards Earth; her residence is determined by the Moon's transit through the 12 Zodiac Rashis.
Exceptions where Bhadra is Auspicious: Destructive or defensive actions align harmoniously with Bhadra's fierce potency. Filing lawsuits, military operations, surgery/administering strong medicine, demolishing dilapidated structures, capturing criminals, and exorcising negative energies flourish in Vishti.
Vedic Remedial Measures: When unavoidable actions must occur during Bhadra, propitiate Lord Shiva (chant "Om Namah Shivaya" 108 times), recite the Hanuman Chalisa, worship Bhadra's 12 sacred names, or perform the task during the tranquil tail portion (Bhadra Puchha) after consulting a qualified Vedic Panchang.