Jyotisha
Jyotish is often discussed as the instructional element of the Rig Veda, and as such is a Vedanga, or "body part" of the Vedas. Jyotish is called the Eye of the Veda, for its believed ability to view both phenomenal reality and wisdom itself. Part of a larger Vedic curriculum including mathematics, architecture, medical and military applications, it superficially has much in common with ancient and modern Western astrology (and the early traces of the descent of various schools of astrology from the Harappan and Egyptian cultures, Chinese and the Chaldean, through the Arabs, Greeks, and early Romans show complex interweavings that are assessed variously by diverse camps of scholars -- who, however, currently find little common ground as to the exact historical development). Jyotish has many facets, and some of its basics are clearly also cornerstones of Western astrology, such as symbolically endowed signs, houses and planets. But Jyotish has its own sophisticated reference to the noumenal: the planets are "grahas", forces that seize or act upon created beings and influence their actions and life.
As Hindus believe that humans have ups and downs in life because of karma, many use Jyotish to understand the downs in life due to the influence of planets, i.e., Navagraha and perform religious ceremonies to mitigate the bad karma,
Foundations
Jyotish's many lineages or paramparas emphasize that its study is a sadhana or technique of mental and existential development. In modern times it is a chief source of reference for many Hindus and other spiritual practitioners. In addition to sustaining its own lore, commentary and debates on the dilemmas of fate and free will and the philosophy of karma, jyotish maintains a virtual materia medica of remedies for difficulties found in horoscopes. Vedic astrologers will frequently prescribe special stones, or specific therapeutic practices or meditation techniques using mantras to those facing difficult or unclear futures as predicted by means consistent with Jyotish methodology. In past centuries, Brahmins have been the primary practitioners of Jyotish. In the last century, a renaissance of study of Jyotish and other Vedic sciences emerged in India and the west.
The foundation of jyotish is the notion of bandhu of the Vedas, which is the connection between the microcosm and the macrocosm. Surya, the Sun, is a manifestation of Vishnu, a central aspect of the Supreme, and is also the Atman within man. The term "Vedic astrology" has been recently introduced by American and Western astrologers in the 1980s and 1990s, leading to collaborative organizations such as the now-international Council of Vedic Astrology.
Jyotish is still commonly used to aid in important decisions in modern India. In Hindu culture, newborns are traditionally named based on their jyotish charts, and jyotish concepts are pervasive in the organization of the calendar and holidays as well as in many areas of life and science. Astrology is vital to decisions made about marriage, opening a new business, and moving into a new home.
Branches of Vedic / Hindu Astrology
Vedic astrology (Aagam Shaastra / Jyotisha- futurity sciences) has three main branches:
Siddhanta (Astronomy): Astronomy & its application to astrology
Samhita (Mundane astrology): Covers Mundane astrology, predicting important events related to countries such as war, earth quakes, political events, astro - meteorology, financial positions, electional astrology; house & construction related matters (Vaastu Shaastra), animals, portents & omens etc.
Hora (Predictive astrology):
This branch has the following different styles / sub branches:-
Jaatak Shaastra / Hora Shaastra (Natal Astrology / horoscopy): Prediction based on individual horoscope.
Muhurt or Muhurtha (Electional astrology): Selection of beneficial time to initiate an activity to get maximum fruition from the life activities.
Swar Shaastra (Phonetical astrology): Predictions based on name & sounds.
Prashna (Horary astrology): Predictions based on time when a question is asked by querent / querist.
Ankjyotisha / Kabala (Numerology): A branch of astrology based on numbers.
Nadi Astrology: An ancient treatise having detailed predictions for individuals.
Tajik Shaastra / Varsha Phal (Annual Horoscopy): Astrology based on annual solar returns.
Jaimini Sutras: A non-conventional method of timing of events based on Famous Indian astrologer, Acharya Jaimini.
Nastjaatakam (Lost Horoscopy): Art of tracing / construction of lost horoscopes.
Streejaatak (female astrology): A special branch of astrology dealing with female nativities.
Other related branches
Graha Samudriki (Astro- Palmistry): Palm reading as horoscope.
Hasta Rekha / Samudrika Shaastra (Palmistry): Based on palm reading.
Padatal Shaastra (Plantarology): Based on reading of lines & signs on the sole.
Shakun Shaastra (Omens): Predictions based on omens & portents.
Swapna Vidhya : Interpretation of dreams.
Kapal Vidya (Phrenology)
Aakriti Vidya (Physiognomy): Based on structure & moles on the body.
Kerala Jyotisha: Predictions based on querrist reply regarding name of flower or colour or touching part of body.
Remedial Astrology: Various modes of propitiation of planets based on planetary positions in nativity, transits, elections & for religious functions.
In Vedic literature guidance is given on two other branches viz, Electional astrology & Remedial astrology.
Hindu and Western astrology
The most easily referred to difference between the two lies in the method of measurement of the Zodiac. Vedic astrology uses primarily the sidereal zodiac (in which stars are considered to be the fixed background against which the motion of the planets is measured), whereas most Western astrology uses the tropical zodiac (the motion of the planets is measured against the position of the Sun on the Spring equinox). Of course, the ancient rishis were aware of the tropical, season-based cycles of northern and southern declination paths of the Sun and used them also when appropriate. But in the popular mind, the main difference between the two systems is that Jyotish uses the sidereal zodiac and Western astrology uses the tropical. The most obvious effect of the sidereal/tropical difference is that about 80% of planets in a Western chart will move to the previous sign in a sidereal reading of the same chart.
A further unique concept in jyotish not seen in Western astrology is the concept of Dashas - a mathematical analyses that breaks down human or the subject's lifetime into various sub-periods based on the location of Moon at birth.
Predictions in jyotish incorporate various elements around the birth chart - influences of transits (similar to Western Astrology though more focused on houses or bhavas) as well as Dashas.
