# Hindu astrology

(Redirected from Jyotiṣa)

Jyotisha or Jyotishya (from Sanskrit jyotiṣa, from jyót “light, heavenly body" and ish - from Isvara or God) is the traditional Hindu system of astrology, also known as Hindu astrology, Indian astrology and more recently Vedic astrology. The term Hindu astrology has been in use as the English equivalent of Jyotiṣa since the early 19th century, whereas Vedic astrology is a relatively recent term, entering common usage in the 1970s with self-help publications on Āyurveda or yoga.

The Vedanga Jyotisha is one of the earliest texts about astronomy within the Vedas.[1][2][3][4] Some scholars believe that the horoscopic astrology practiced in the Indian subcontinent came from Hellenistic influences,[5][6] however, this is a point of intense debate and other scholars believe that Jyotisha developed independently although it may have interacted with Greek astrology.[7]

Following a judgement of the Andhra Pradesh High Court in 2001 which favoured astrology, some Indian universities now offer advanced degrees in Hindu astrology. The scientific consensus is that astrology is a pseudoscience.[8][9][10][11][12]

## Etymology

Jyotisha, states Monier-Williams, is rooted in the word Jyotish, which means light, such as that of the sun or the moon or heavenly body. The term Jyotisha includes the study of astronomy, astrology and the science of timekeeping using the movements of astronomical bodies.[13][14] It aimed to keep time, maintain calendars, and predict auspicious times for Vedic rituals.[13][14][15]

## History and core principles

Jyotiṣa is one of the Vedāṅga, the six auxiliary disciplines used to support Vedic rituals.[16]: 376  Early jyotiṣa is concerned with the preparation of a calendar to determine dates for sacrificial rituals,[16]: 377  with nothing written regarding planets.[16]: 377  There are mentions of eclipse-causing "demons" in the Atharvaveda and Chāndogya Upaniṣad, the latter mentioning Rāhu (a shadow entity believed responsible for eclipses and meteors).[16]: 382  The term graha, which is now taken to mean planet, originally meant demon.[16]: 381  The Ṛigveda also mentions an eclipse-causing demon, Svarbhānu, however the specific term graha was not applied to Svarbhānu until the later Mahābhārata and Rāmāyaṇa.[16]: 382

The foundation of Hindu astrology is the notion of bandhu of the Vedas (scriptures), which is the connection between the microcosm and the macrocosm. Practice relies primarily on the sidereal zodiac, which differs from the tropical zodiac used in Western (Hellenistic) astrology in that an ayanāṃśa adjustment is made for the gradual precession of the vernal equinox. Hindu astrology includes several nuanced sub-systems of interpretation and prediction with elements not found in Hellenistic astrology, such as its system of lunar mansions (Nakṣatra). It was only after the transmission of Hellenistic astrology that the order of planets in India was fixed in that of the seven-day week.[16]: 383 [17] Hellenistic astrology and astronomy also transmitted the twelve zodiacal signs beginning with Aries and the twelve astrological places beginning with the ascendant.[16]: 384  The first evidence of the introduction of Greek astrology to India is the Yavanajātaka which dates to the early centuries CE.[16]: 383  The Yavanajātaka (lit. "Sayings of the Greeks") was translated from Greek to Sanskrit by Yavaneśvara during the 2nd century CE, and is considered the first Indian astrological treatise in the Sanskrit language.[18] However the only version that survives is the verse version of Sphujidhvaja which dates to AD 270.[16]: 383  The first Indian astronomical text to define the weekday was the Āryabhaṭīya of Āryabhaṭa (born AD 476).[16]: 383

According to Michio Yano, Indian astronomers must have been occupied with the task of Indianizing and Sanskritizing Greek astronomy during the 300 or so years between the first Yavanajataka and the Āryabhaṭīya.[16]: 388  The astronomical texts of these 300 years are lost.[16]: 388  The later Pañcasiddhāntikā of Varāhamihira summarizes the five known Indian astronomical schools of the sixth century.[16]: 388  Indian astronomy preserved some of the older pre-Ptolemaic elements of Greek astronomy.[16]: 389 [19][20][21][14]

The main texts upon which classical Indian astrology is based are early medieval compilations, notably the Bṛhat Parāśara Horāśāstra, and Sārāvalī by Kalyāṇavarma. The Horāshastra is a composite work of 71 chapters, of which the first part (chapters 1–51) dates to the 7th to early 8th centuries and the second part (chapters 52–71) to the later 8th century.[citation needed] The Sārāvalī likewise dates to around 800 CE.[22] English translations of these texts were published by N. N. Krishna Rau and V. B. Choudhari in 1963 and 1961, respectively.

## Modern Hindu astrology

Nomenclature of the last two centuries

Astrology remains an important facet of folk belief in the contemporary lives of many Hindus. In Hindu culture, newborns are traditionally named based on their jyotiṣa charts (Kundali), and astrological concepts are pervasive in the organization of the calendar and holidays, and in making major decisions such as those about marriage, opening a new business, or moving into a new home. Many Hindus believe that heavenly bodies, including the planets, have an influence throughout the life of a human being, and these planetary influences are the "fruit of karma". The Navagraha, planetary deities, are considered subordinate to Ishvara (the Hindu concept of a supreme being) in the administration of justice. Thus, it is believed that these planets can influence earthly life.[23]

### Astrology as a science

Astrology has been rejected by the scientific community as having no explanatory power for describing the universe. Scientific testing of astrology has been conducted, and no evidence has been found to support any of the premises or purported effects outlined in astrological traditions.[24]: 424  There is no mechanism proposed by astrologers through which the positions and motions of stars and planets could affect people and events on Earth. In spite of its status as a pseudoscience, in certain religious, political, and legal contexts, astrology retains a position among the sciences in modern India.[25]

India's University Grants Commission and Ministry of Human Resource Development decided to introduce "Jyotir Vigyan" (i.e. jyotir vijñāna) or "Vedic astrology" as a discipline of study in Indian universities, stating that "vedic astrology is not only one of the main subjects of our traditional and classical knowledge but this is the discipline, which lets us know the events happening in human life and in universe on time scale"[26] in spite of the complete lack of evidence that astrology actually does allow for such accurate predictions.[27] The decision was backed by a 2001 judgement of the Andhra Pradesh High Court, and some Indian universities offer advanced degrees in astrology.[28][29] This was met with widespread protests from the scientific community in India and Indian scientists working abroad.[30] A petition sent to the Supreme Court of India stated that the introduction of astrology to university curricula is "a giant leap backwards, undermining whatever scientific credibility the country has achieved so far".[26]

In 2004, the Supreme Court dismissed the petition,[31][32] concluding that the teaching of astrology did not qualify as the promotion of religion.[33][34] In February 2011, the Bombay High Court referred to the 2004 Supreme Court ruling when it dismissed a case which had challenged astrology's status as a science.[35] As of 2014, despite continuing complaints by scientists,[36][37] astrology continues to be taught at various universities in India,[34][38] and there is a movement in progress to establish a national Vedic University to teach astrology together with the study of tantra, mantra, and yoga.[39]

Indian astrologers have consistently made claims that have been thoroughly debunked by skeptics. For example, although the planet Saturn is in the constellation Aries roughly every 30 years (e.g. 1909, 1939, 1968), the astrologer Bangalore Venkata Raman claimed that "when Saturn was in Aries in 1939 England had to declare war against Germany", ignoring all the other dates.[40] Astrologers regularly fail in attempts to predict election results in India, and fail to predict major events such as the assassination of Indira Gandhi. Predictions by the head of the Indian Astrologers Federation about war between India and Pakistan in 1982 also failed.[40]

In 2000, when several planets happened to be close to one another, astrologers predicted that there would be catastrophes, volcanic eruptions and tidal waves. This caused an entire sea-side village in the Indian state of Gujarat to panic and abandon their houses. The predicted events did not occur and the vacant houses were burgled.[41]

## Texts

Time keeping

[The current year] minus one,
multiplied by twelve,
multiplied by two,
added to the elapsed [half months of current year],
increased by two for every sixty [in the sun],
is the quantity of half-months (syzygies).

— Rigveda Jyotisha-vedanga 4
Translator: Kim Plofker[42]

The ancient extant text on Jyotisha is the Vedanga-Jyotisha, which exists in two editions, one linked to Rigveda and other to Yajurveda.[43] The Rigveda version consists of 36 verses, while the Yajurveda recension has 43 verses of which 29 verses are borrowed from the Rigveda.[44][45] The Rigveda version is variously attributed to sage Lagadha, and sometimes to sage Shuci.[45] The Yajurveda version credits no particular sage, has survived into the modern era with a commentary of Somakara, and is the more studied version.[45]

The Jyotisha text Brahma-siddhanta, probably composed in the 5th century CE, discusses how to use the movement of planets, sun and moon to keep time and calendar.[46] This text also lists trigonometry and mathematical formulae to support its theory of orbits, predict planetary positions and calculate relative mean positions of celestial nodes and apsides.[46] The text is notable for presenting very large integers, such as 4.32 billion years as the lifetime of the current universe.[47]

The ancient Hindu texts on Jyotisha only discuss time keeping,s and never mention astrology or prophecy.[48] These ancient texts predominantly cover astronomy, but at a rudimentary level.[49] Technical horoscopes and astrology ideas in India came from Greece and developed in the early centuries of the 1st millennium CE.[50][19][20] Later medieval era texts such as the Yavana-jataka and the Siddhanta texts are more astrology-related.[51]

## Discussion

The field of Jyotisha deals with ascertaining time, particularly forecasting auspicious day and time for Vedic rituals.[14] The field of Vedanga structured time into Yuga which was a 5-year interval,[42] divided into multiple lunisolar intervals such as 60 solar months, 61 savana months, 62 synodic months and 67 sidereal months.[43] A Vedic Yuga had 1,860 tithis (तिथि, dates), and it defined a savana-day (civil day) from one sunrise to another.[52]

The Rigvedic version of Jyotisha may be a later insertion into the Veda, states David Pingree, possibly between 513 and 326 BCE, when Indus valley was occupied by the Achaemenid from Mesopotamia.[53] The mathematics and devices for time keeping mentioned in these ancient Sanskrit texts, proposes Pingree, such as the water clock may also have arrived in India from Mesopotamia. However, Yukio Ohashi considers this proposal as incorrect,[19] suggesting instead that the Vedic timekeeping efforts, for forecasting appropriate time for rituals, must have begun much earlier and the influence may have flowed from India to Mesopotamia.[52] Ohashi states that it is incorrect to assume that the number of civil days in a year equal 365 in both Hindu and Egyptian–Persian year.[54] Further, adds Ohashi, the Mesopotamian formula is different from the Indian formula for calculating time, each can only work for their respective latitude, and either would make major errors in predicting time and calendar in the other region.[55] According to Asko Parpola, the Jyotisha and luni-solar calendar discoveries in ancient India, and similar discoveries in China in "great likelihood result from convergent parallel development", and not from diffusion from Mesopotamia.[56]

Kim Plofker states that while a flow of timekeeping ideas from either side is plausible, each may have instead developed independently, because the loan-words typically seen when ideas migrate are missing on both sides as far as words for various time intervals and techniques.[57][58] Further, adds Plofker, and other scholars, that the discussion of time keeping concepts are found in the Sanskrit verses of the Shatapatha Brahmana, a 2nd millennium BCE text.[57][59] Water clock and sun dials are mentioned in many ancient Hindu texts such as the Arthashastra.[60][61] Some integration of Mesopotamian and Indian Jyotisha-based systems may have occurred in a roundabout way, states Plofker, after the arrival of Greek astrology ideas in India.[62]

The Jyotisha texts present mathematical formulae to predict the length of day time, sun rise and moon cycles.[52][63][64] For example,

The length of daytime = ${\displaystyle \left(12+{\frac {2}{61}}n\right)}$  muhurtas[65]
where n is the number of days after or before the winter solstice, and one muhurta equals 130 of a day (48 minutes).[66]

Water clock
A prastha of water [is] the increase in day, [and] decrease in night in the [sun's] northern motion; vice versa in the southern. [There is] a six-muhurta [difference] in a half year.

— Yajurveda Jyotisha-vedanga 8, Translator: Kim Plofker[65]

## Elements

There are sixteen Varga (Sanskrit: varga, 'part, division'), or divisional, charts used in Hindu astrology:[67][unreliable source?]: 61–64

### Rāśi – zodiacal signs

The Nirayana, or sidereal zodiac, is an imaginary belt of 360 degrees, which, like the Sāyana, or tropical zodiac, is divided into 12 equal parts. Each part (of 30 degrees) is called a sign or rāśi (Sanskrit: 'part'). Vedic (Jyotiṣa) and Western zodiacs differ in the method of measurement. While synchronically, the two systems are identical, Jyotiṣa primarily uses 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). After two millennia, as a result of the precession of the equinoxes, the origin of the ecliptic longitude has shifted by about 22 degrees. As a result, the placement of planets in the Jyotiṣa system is roughly aligned with the constellations, while tropical astrology is based on the solstices and equinoxes.

No. Sanskrit[68] Transliteration Starting Representation English Punjabi Bengali Kannada Gujarati Odia Telugu Tamil Malayalam Element Quality Ruling Astrological Body
1 मेष Meṣa ram Aries ਮੇਖ মেষ ಮೇಷ મેષ ମେଷ మేషము மேசம் മേടം Fire Chara (movable) Mars
2 वृषभ Vṛṣabha 30° bull Taurus ਬ੍ਰਿਖ বৃষ ವೃಷಭ વૃષભ ବୃଷ వృషభము ரிசபம் ഇടവം Earth Sthira (fixed) Venus
3 मिथुन Mithuna 60° twins Gemini ਮਿਥੁਨ মিথুন ಮಿಥುನ મિથૂન ମିଥୁନ మిథునము மிதுனம் മിഥുനം Air Dvisvabhava (dual) Mercury
4 कर्क Karka 90° crab Cancer ਕਰਕ কর্কট ಕರ್ಕಾಟಕ કર્ક କର୍କଟ కర్కాటకము கடகம் കർക്കടകം Water Chara (movable) Moon
5 सिंह Siṃha 120° lion Leo ਸਿੰਘ সিংহ ಸಿಂಹ સિંહ ସିଂହ సింహము சிம்மம் ചിങ്ങം Fire Sthira (fixed) Sun
6 कन्या Kanyā 150° virgin girl Virgo ਕੰਨਿਆ কন্যা ಕನ್ಯಾ કન્યા କନ୍ୟା కన్య கன்னி കന്നി Earth Dvisvabhava (dual) Mercury
7 तुला Tulā 180° balance Libra ਤੁਲਾ তুলা ತುಲಾ તુલા ତୁଳା తుల துலாம் തുലാം Air Chara (movable) Venus
8 वृश्चिक Vṛścika 210° scorpion Scorpio ਬ੍ਰਿਸ਼ਚਕ বৃশ্চিক ವೃಶ್ಚಿಕ વૃશ્ચિક ବିଛା వృశ్చికము விருச்சிகம் വൃശ്ചികം Water Sthira (fixed) Mars
9 धनुष Dhanuṣa 240° bow and arrow Sagittarius ਧਨੁ ধনু ಧನು ધનુષ ଧନୁ ధనుస్సు தனுசு ധനു Fire Dvisvabhava (dual) Jupiter
10 मकर Makara 270° crocodile Capricorn ਮਕਰ মকর ಮಕರ મકર ମକର మకరము மகரம் മകരം Earth Chara (movable) Saturn
11 कुम्भ Kumbha 300° water-bearer Aquarius ਕੁੰਭ কুম্ভ ಕುಂಭ કુંભ କୁମ୍ଭ కుంభము கும்பம் കുംഭം Air Sthira (fixed) Saturn
12 मीन Mīna 330° fishes Pisces ਮੀਨ মীন ಮೀನ મીન ମୀନ మీనము மீனம் മീനം Water Dvisvabhava (dual) Jupiter

### Nakṣhatras – lunar mansions

Nakshatras

The nakshatras or lunar mansions are 27 equal divisions of the night sky used in Hindu astrology, each identified by its prominent star(s).[67]: 168

Historical (medieval) Hindu astrology enumerated either 27 or 28 nakṣatras. In modern astrology, a rigid system of 27 nakṣatras is generally used, each covering 13° 20′ of the ecliptic. The missing 28th nakshatra is Abhijeeta. Each nakṣatra is divided into equal quarters or padas of 3° 20′. Of greatest importance is the Abhiśeka Nakṣatra, which is held as king over the other nakṣatras. Worshipping and gaining favour over this nakṣhatra is said to give power to remedy all the other nakṣatras, and is of concern in predictive astrology and mitigating Karma.[citation needed]

The 27 nakshatras are:[citation needed]

1. Ashvini
2. Bharni
3. Krittika
4. Rohini
5. Mrighashirsha
6. Ardra or Aarudhra
7. Punarvasu
8. Pushya
9. Aslesha
10. Magha
11. Purva Phalguni
12. Uttara Phalguni
13. Hasta
14. Chitra
15. Swati
16. Vishakha
18. Jyeshtha
19. Moola
22. Shravana
23. Dhanishta
24. Shatabhishak
27. Revati

The junction of two rashis as well as Nakshatras is known as Gandanta.[69]

### Daśās – planetary periods

The word dasha (Devanāgarī: दशा, Sanskrit,daśā, 'planetary period') means 'state of being' and it is believed that the daśā largely governs the state of being of a person. The Daśā system shows which planets may be said to have become particularly active during the period of the Daśā. The ruling planet (the Daśānātha or 'lord of the Daśā') eclipses the mind of the person, compelling him or her to act per the nature of the planet.

There are several dasha systems, each with its own utility and area of application. There are Daśās of grahas (planets) as well as Daśās of the Rāśis (zodiac signs). The primary system used by astrologers is the Viṁśottarī Daśā system, which has been considered universally applicable in the Kali Yuga to all horoscopes.

The first Mahā-Daśā is determined by the position of the natal Moon in a given Nakṣatra. The lord of the Nakṣatra governs the Daśā. Each Mahā-Dāśā is divided into sub-periods called bhuktis, or antar-daśās, which are proportional divisions of the maha-dasa. Further proportional sub-divisions can be made, but error margins based on accuracy of the birth time grow exponentially. The next sub-division is called pratyantar-daśā, which can in turn be divided into sookshma-antardasa, which can in turn be divided into praana-antardaśā, which can be sub-divided into deha-antardaśā. Such sub-divisions also exist in all other Daśā systems.

### Grahas – planets

The Navagraha (nava; Devanagari: नव, Sanskrit: nava, "nine"; graha; Devanagari: ग्रह, Sanskrit: graha, 'planet')[70]) describe the nine celestial bodies used in Hindu astrology:[67]: 38–51

No. Name (Vedic) Western equivalent
1. Surya Sun
2. Chandra Moon
3. Budha Mercury
4. Shukra Venus
5. Mangala Mars
6. Bṛhaspati, "Guru" Jupiter
7. Shani Saturn
8. Rahu North node of the Moon
9. Ketu South node of the Moon

The Navagraha are said to be forces that capture or eclipse the mind and the decision making of human beings, thus the term graha. When the grahas are active in their Daśās or periodicities they are said to be particularly empowered to direct the affairs of people and events.

Planets are held to signify major details[71] like profession, marriage and longevity.[72] Of these indicators, known as Karakas, Parashara considers Atmakaraka most important, signifying broad contours of a person's life.[72]: 316

Rahu and Ketu correspond to the points where the moon crosses the ecliptic plane (known as the ascending and descending nodes of the moon). Classically known in Indian and Western astrology as the "head and tail of the dragon", these planets are represented as a serpent-bodied demon beheaded by the Sudarshan Chakra of Vishnu after attempting to swallow the sun. They are primarily used to calculate the dates of eclipses. They are described as "shadow planets" because they are not visible in the night sky. Rahu has an orbital cycle of 18 years, Ketu has an orbital cycle of 7 years and they are always retrograde in motion and 180 degrees from each other.

### Gocharas – transits

A natal chart shows the position of the grahas at the moment of birth. Since that moment, the grahas have continued to move around the zodiac, interacting with the natal chart grahas. This period of interaction is called gochara (Sanskrit: gochara, 'transit').[67]: 227

The study of transits is based on the transit of the Moon (Chandra), which spans roughly two days, and also on the movement of Mercury (Budha) and Venus (Śukra) across the celestial sphere, which is relatively fast as viewed from Earth. The movement of the slower planets – Jupiter (Guru), Saturn (Śani) and Rāhu–Ketu — is always of considerable importance. Astrologers study the transit of the Daśā lord from various reference points in the horoscope.

The transit phase always makes an impact on the lives of humans on earth which can be positive or negative however as per the astrologers the impact of transits can be neutralised with remedies.

#### Yogas – planetary combinations

In Hindu astronomy, yoga (Sanskrit: yoga, 'union') is a combination of planets placed in a specific relationship to each other.[67]: 265

Rāja yogas are perceived as givers of fame, status and authority, and are typically formed by the association of the Lord of Keṅdras ('quadrants'), when reckoned from the Lagna ('ascendant'), and the Lords of the Trikona ('trines', 120 degrees—first, fifth and ninth houses). The Rāja yogas are culminations of the blessings of Viṣṇu and Lakṣmī. Some planets, such as Mars for Leo Lagna, do not need another graha (or Navagraha, 'planet') to create Rājayoga, but are capable of giving Rājayoga by themselves due to their own lordship of the 4th Bhāva ('astrological house') and the 9th Bhāva from the Lagna, the two being a Keṅdra ('angular house'—first, fourth, seventh and tenth houses) and Trikona Bhāva respectively.

Dhana Yogas are formed by the association of wealth-giving planets such as the Dhaneśa or the 2nd Lord and the Lābheśa or the 11th Lord from the Lagna. Dhana Yogas are also formed due to the auspicious placement of the Dārāpada (from dara, 'spouse' and pada, 'foot'—one of the four divisions—3 degrees and 20 minutes—of a Nakshatra in the 7th house), when reckoned from the Ārūḍha Lagna (AL). The combination of the Lagneśa and the Bhāgyeśa also leads to wealth through the Lakṣmī Yoga.

Sanyāsa Yogas are formed due to the placement of four or more grahas, excluding the Sun, in a Keṅdra Bhāva from the Lagna.

There are some overarching yogas in Jyotiṣa such as Amāvasyā Doṣa, Kāla Sarpa Yoga-Kāla Amṛta Yoga and Graha Mālika Yoga that can take precedence over Yamaha yogar planetary placements in the horoscope.

### Bhāvas – houses

The Hindu Jātaka or Janam Kundali or birth chart, is the Bhāva Chakra (Sanskrit: 'division' 'wheel'), the complete 360° circle of life, divided into houses, and represents a way of enacting the influences in the wheel. Each house has associated kāraka (Sanskrit: 'significator') planets that can alter the interpretation of a particular house.[67]: 93–167  Each Bhāva spans an arc of 30° with twelve Bhāvas in any chart of the horoscope. These are a crucial part of any horoscopic study since the Bhāvas, understood as 'state of being', personalize the Rāśis/ Rashis to the native and each Rāśi/ Rashi apart from indicating its true nature reveals its impact on the person based on the Bhāva occupied. The best way to study the various facets of Jyotiṣa is to see their role in chart evaluation of actual persons and how these are construed.

### Dṛiṣṭis

Drishti (Sanskrit: Dṛṣṭi, 'sight') is an aspect to an entire house. Grahas cast only forward aspects, with the furthest aspect being considered the strongest. For example, Jupiter aspects the 5th, 7th and 9th house from its position, Mars aspects the 4th, 7th, and 8th houses from its position, and its 8th house.[67]: 26–27

The principle of Drishti (aspect) was devised on the basis of the aspect of an army of planets as deity and demon in a war field.[73][74] Thus the Sun, a deity king with only one full aspect, is more powerful than the demon king Saturn, which has three full aspects.

Aspects can be cast both by the planets (Graha Dṛṣṭi) and by the signs (Rāśi Dṛṣṭi). Planetary aspects are a function of desire, while sign aspects are a function of awareness and cognizance.

There are some higher aspects of Graha Dṛṣṭi (planetary aspects) that are not limited to the Viśeṣa Dṛṣṭi or the special aspects. Rāśi Dṛṣṭi works based on the following formulaic structure: all movable signs aspect fixed signs except the one adjacent, and all dual and mutable signs aspect each other without exception.

## References

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4. ^
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## Bibliography

• Burgess, Ebenezer (1866). "On the Origin of the Lunar Division of the Zodiac represented in the Nakshatra System of the Hindus". Journal of the American Oriental Society.
• Chandra, Satish (2002). "Religion and State in India and Search for Rationality". Social Scientist
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• Jain, Sanat K. "Astrology a science or myth", New Delhi, Atlasntic Publishers 2005 - highlighting how every principle like sign lord, aspect, friendship-enmity, exalted-debilitated, Mool trikon, dasha, Rahu-Ketu, etc. were framed on the basis of the ancient concept that Sun is nearer than the Moon from the Earth, etc.
• Pingree, David (1963). "Astronomy and Astrology in India and Iran". Isis – Journal of The History of Science Society. pp. 229–246.
• Pingree, David (1981). Jyotiḥśāstra in J. Gonda (ed.) A History of Indian Literature. Vol VI. Fasc 4. Wiesbaden: Otto Harrassowitz.
• Pingree, David and Gilbert, Robert (2008). "Astrology; Astrology In India; Astrology in modern times". Encyclopædia Britannica. online ed.
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• Whitney, William D. (1866). "On the Views of Biot and Weber Respecting the Relations of the Hindu and Chinese Systems of Asterisms", Journal of the American Oriental Society
Popular treatments
• Frawley, David (2000). Astrology of the Seers: A Guide to Vedic (Hindu) Astrology. Twin Lakes Wisconsin: Lotus Press. ISBN 0-914955-89-6
• Frawley, David (2005). Ayurvedic Astrology: Self-Healing Through the Stars. Twin Lakes Wisconsin: Lotus Press. ISBN 0-940985-88-8
• Sutton, Komilla (1999). The Essentials of Vedic Astrology. The Wessex Astrologer, Ltd.: Great Britain. ISBN 1902405064