Indian astrologers claim they can tell a person’s intelligence from his or her horoscope. But twenty-seven astrologers failed to perform better than chance
when given forty horoscopes of intellectually bright subjects and mentally handicapped subjects.
In the world of astrology, India has many claims to fame. It has an astrology fundamentally different from both Chinese and Western astrology,1
possibly more part- and full-time astrologers than in the rest of the world put together, and the world’s longest-running English astrological monthly (The Astrological Magazine 1895–2007). Its main government funding agency, the University Grants Commission, provides support for BSc and MSc
courses in astrology in Indian universities. And as for the general public, one finds almost universal belief in it.
Indian astronomer and astrology critic Balachandra Rao (2000, 149) notes: “The belief in astrology among our masses is so deep that for every trivial
decision in their personal lives—like whether to apply for a job or not—they readily rush to the astrologers with their horoscopes.” Likewise, many will consult an astrologer to ensure their marriage date will be auspicious. In
1963, the astrologer’s advice, for example, led to a postponement of the wedding of the Crown Prince of Sikkim by a year. A day seen as generally
auspicious can thus lead to a large number of weddings taking place, putting severe pressure on facilities like wedding halls, caterers, etc.
Prediction of Events
Western astrologers are generally taught that astrology is nonfatalistic and therefore not a good bet for predicting events. Indian astrologers hold the
opposite view, and every astrologer worthy of the name must be able to make such forecasts. Unfortunately, these predictions do not carry any controls. For
example, B.V. Raman (1912–1998), publisher-editor of The Astrological Magazine, wrote that “when Saturn was in Aries in 1939 England had to
declare war against Germany” (note the fatalism) in a work intended “to present a case for astrology” (Raman 1992, 119). However, this reasoning fails to
notice that Saturn was also in Aries in 1909 and 1968 when nothing much happened other than overseas state visits by Edward VII and Elizabeth II,
Indian astrologers often make extreme claims about Indian astronomy, as when The Astrological Magazine for March 1984 claimed Uranus,
Neptune, and Pluto had been discovered around 500 BC (Rao 2000, 36). But their claims about Indian astrology tend to be even more extreme, as in the August
25, 2003, Indian Express wherein Raj Baldev, who claimed to be “an authority on the subject of Astronomy, Astrology, Cosmo-Mathematics and
Metaphysics” said that ancient Hindu astrology “is a complete science” where even one million billionth of a second “makes a lot of difference.” Skeptics
might wonder at this, since it implies that the shadows cast on ancient sundials were routinely positioned to better accuracy than a hundred millionth of
the diameter of an atom. Even at night. Can we believe it?
Complexity without End
Indian astrology is more complex than Western astrology, with countless authoritative aphorisms to cover every possible situation. Indeed, the few Western
authors who have described it for Western use have typically required decades of study before proceeding. But as one of them has noted: “This is of course
natural for a society over 6,000 years old whose elders have not only employed astrology but embraced it” (Braha 1986, x).2
And there is no Western equivalent to the ways in which those authoritative aphorisms can be modified via suitably chosen amulets, mantras, colors,
gemstones (yellow or blue sapphire is said to strengthen Jupiter or Saturn, respectively), and by performing yajnas (a spiritual ceremony
involving offerings to fire performed by a Hindu priest). Ironically these modifications specified by the astrologer are essentially fatalistic ways of
achieving non-fatalistic outcomes.
they are interpreted. A Western-style interpretation focusing on the owner’s personality and motivations would be rejected in India, where clients expect
Indian Nadi astrology has many variations, but if any of them worked it would be a miracle. Nadi astrologers, when approached by a client, are found to
have a huge collection of horoscopes on ancient palm leaves, one of which turns out to be the client’s. But a little thinking shows that it is not as
miraculous as it may seem. Consider the following scenario.
After providing birth details during the first visit, the client is asked to return a few days later on the pretext that it will take time to find his
horoscope among the thousands held by the astrologer. While the client is away, the astrologer, based on the information supplied by the client, writes his
or her horoscope on a fresh palm leaf and soaks it in a slurry of coconut kernels and mango bark, both of which are rich in tannin. This gives the palm
leaf an ancient look (Premanand et al. 1993, 331). During the second visit the client is appropriately impressed that his/her horoscope turned up after so
In 1984, the first companies to offer computerized horoscopes appeared in India, seventeen years after they had started business in Europe. In twenty
minutes (today, in just a few seconds) they could do the calculations that previously took three months. A computer horoscope may cost twenty-five rupees
(about fifty cents) for an ordinary one and fifty rupees (about $1) for a longer one, more in big cities or air-conditioned centers. Predictions cost up to
500 rupees depending on the number of years ahead (Rao 2000, 147).3 Many websites offer free horoscopes; see, for example,
As in the West, Indian astrologers immediately complained that the computer was devoid of intuition and experience, and did not meet their clients’ need to
talk and vent their feelings. Indeed, about two decades ago an educated young man committed suicide after a computer horoscope predicted total failure in
everything he did (Premanand et al. 1993, 307). Nevertheless, as in the West, computer horoscopes seem here to stay.
In 1989, I was showing a visitor around my newly established astronomy center in Pune. At that time we had just set up our new computer and I explained its
capabilities to the visitor. At the end, I waited for any questions she may have had. Yes, she did have a question: “Does this computer cast horoscopes?”
The Ultimate Accolade
The lobby for Indian astrology had its crowning glory when, in February 2001, the University Grants Commission (UGC) decided to provide funds for BSc and
MSc courses in astrology at Indian universities. Its circular stated: “There is urgent need to rejuvenate the science of Vedic Astrology in India . . . and
to provide opportunities to get this important science exported to the world.” Actually, the phrase Vedic Astrology is an oxymoron since the
prefix Vedic has nothing to do with the Vedas, the ancient and sacred literature of the Hindus, which do not mention astrology. In fact, scholars
agree that the usual planetary astrology came to India with the Greeks who had visited India since Alexander’s campaign in the third century BC.
Within nine months of the UGC’s announcement, forty-five of India’s 200 universities had applied for the UGC grants of 1.5 million rupees (about $30,000)
to establish departments of astrology. Of these, twenty were accepted (Siddhanta 2001, 2). To those Indians who believe that astrological considerations
influence the course of their business and family lives—and this category involves leaders of major political parties—the UGC’s decision might seem
sensible if overdue.
But the decision provoked outrage among India’s academics, especially those in the science faculties. More than 100 scientists and 300 social scientists
wrote in protest to the government. Of the thirty letters-to-the-editor that appeared in the Indian science journal Current Science, most of them
from scientists in university departments or research institutes, about half dismissed astrology as a pseudoscience, and a quarter felt that decisive tests
were needed. Against this, the rest felt there was nothing wrong with funding something that most Indian people believe in. But the protests were without
effect because, in Indian law, Vedic astrology is seen as a scientific discipline.
Nevertheless, in 2004, several scientists asked the Andhra Pradesh High Court to stop the UGC from funding courses in Vedic astrology because it was a
pseudoscience, it would impose Hindu beliefs on the education system,4 and it would reduce the funds available for genuine scientific research.
However, the court dismissed their case on the grounds that it was not correct for a court to interfere with a UGC decision that did not violate Indian
In 2011, an appeal under the act that bans false advertising was made to the Mumbai High Court. It was dismissed by the court arguing that the act “does
not cover astrology and related sciences. Astrology is a trusted science and is being practiced for over 4000 years. . . .” (as reported in The Times of India February 3, 2011).
To justify calling it a science, astrology must fulfill the basic requirement of a scientific theory—it must make testable and correct predictions. Here
the performance of astrology in predicting the results of events has been very poor. The nearest we have are follow-ups to predictions of public events
such as elections, where failure is the norm. For example, the elections in 1971 were a showdown between Indira Gandhi and her political opponents. The Astrological Magazine was filled with predictions by amateurs and professionals, most of whom predicted that Gandhi would lose. In fact, she
won with an overwhelming majority.
The 1980 elections attracted another frenzy of predictions, most of which saw Gandhi losing. For example B.V. Raman (whom I discussed earlier), in a rare
departure from his usual vagueness, predicted that Gandhi’s efforts to regain office “may misfire. Her ability to influence the Government will be
disconcertingly limited in effectiveness” and the outcome “may not see a stable Government.” An Indian horary astrologer (one who answers questions)
predicted that Gandhi “can never become the Prime Minister.” However, she won with a huge majority, was prime minister, and formed a very stable
Also in 1980, at a large international conference organized by the Indian Astrologers Federation, both the president and secretary of the Federation
predicted a war with Pakistan in 1982, which India would win, and a world war between 1982 and 1984. All wrong! These examples and many more are given by
Rao (2000, 113–122), who notes that no astrologer predicted Gandhi’s assassination in 1984, and that the golden rule seems to be “predict only those things
which please the listener’s ego.”5
Lack of Criticism
In the West, books critical of astrology are not hard to find, but in India the reverse is true. Some excellent books exist, such as Premanand et al.
(1993) and Rao (2000), but all are hampered by a lack of Indian tests with which to counter true believers. Even Current Science had to wait until
Manoj Komath’s (2009) review, which drew heavily on Western sources such as the critical but user-friendly www.astrology-and-science.com. Unfortunately,
given the low level of income and high level of illiteracy of the masses, web sources may not be very effective in general.
UGC’s funding of astrology might have been justifiable had Indian astrology ever been a source of new knowledge (it hadn’t; see Siddhanta 2001, 13), or if
its modus operandi had been verified by controlled tests. But unlike astrology in the West, where several hundred controlled tests have found no support
commensurate with its claims (Dean 2007), astrology in India had hitherto been without controlled tests, even though its focus on predicting yes/no events
would make testing easy.6 I will now describe a controlled test that my colleagues and I conducted recently.
Our experiment was performed in the university city of Pune (formerly Poona) about 160 km (100 miles) southeast of Mumbai (formerly Bombay) in the state
of Maharashtra, which is the second-largest in population and third-largest in area of India’s twenty-five states. Pune itself has a population of about
For the experiment I was assisted by Professor Sudhakar Kunte from the Department of Statistics at Pune University, Narendra Dabholkar from the Committee
for the Eradication of Superstitions, and Prakash Ghatpande a former professional astrologer who has subsequently turned into a critic of astrology.
Indian astrologers claim that they are able to tell intelligence from a person’s horoscope. So volunteers from the Committee for the Eradication of
Superstitions went to different schools and collected the names of teenage school children rated by their teachers as mentally bright. They also collected
names from special schools for the mentally handicapped. The destinies of these cases could hardly be more different, so they were ideal for testing the
above claim. From the collected data we selected 100 bright and 100 mentally handicapped cases whose age distribution is shown on the next page.
Birth details were obtained from their parents because birth certificates are rare in India. Professional Indian astrologers routinely assume that birth
details provided by parents are correct, so our procedure followed the norm. Each horoscope (birth chart) was calculated by one of us (PG) using commercial
astrological software. All horoscopes were coded and stored in safe custody by Professor Kunte at Pune University, so that neither the experimenters (our
group of four) nor the astrologers could know the identities of the individuals.
We announced our experiment at a press conference in Pune May 12, 2008, and invited practicing astrologers to take part. We explained that each participant
would be given forty horoscopes drawn at random from our set of 200 and would have to judge whether their owners were mentally bright or handicapped. We
also invited established astrological organizations to take part, for which they would be given all 200 horoscopes, a respectably large sample size.
The press conference, which was reported in almost all local and regional newspapers, proved to be an efficient way to reach astrologers. Within a few days
we received about 150 telephone calls from astrologers all over Maharashtra expressing interest. We asked them to send us their names, experience, and
method of prediction used, together with a stamped self-addressed envelope for mailing the forty horoscopes. They were then allowed one month for making
their judgments. In due course, fifty-one astrologers asked for horoscopes, of which twenty-seven from all over Maharashtra sent back their judgments. The
rest did not tell us why they chose not to participate.
Astrologers from the Pune and Maharashtra astrological societies expressed concern that, because the data had been collected by skeptics, the experiment
would be biased. We assured them that the skepticism of data collectors had no active role in running the experiment, and that the experiment was of the
double-blind kind to make sure it was entirely fair. But they were not convinced, and tried (unsuccessfully) to dissuade other astrologers from
A month later, at a Pune astrological seminar, we explained that tests, indeed many tests, are necessary if astrology is to establish itself as a science.
The organizer then said he could provide a set of ten rules that would tell whether a horoscope’s owner was mentally bright or handicapped, and urged the
astrologers present to participate in our experiment.
In India, leading astrologers have their own astrological organizations, and so we wrote to those on our list (about a dozen) inviting them to judge all
200 horoscopes. Two responded with expressions of interest, of which one sent in its judgment. The other remained silent.
An Interesting Sub-Test
Although the Maharashtra Astrological Society had urged astrologers to boycott our experiment, its president kept meeting with us. Among other things he
gave us a rule for predicting sex and another rule for predicting intelligence, both of which he claimed were correct in 60 percent of cases. But when
applied to our set of 200 horoscopes, the predictions were respectively 47 and 50 percent correct, which offers no advantage over pure guessing or tossing
Results of Our Main Test
cues but evidently didn’t.
Of the twenty-seven astrologers who participated, not all provided personal details, but fifteen were hobbyists, eight were professionals, nine had up to
ten years of experience, and seventeen had more than ten years of experience. So they clearly formed a competent group. Their average experience was
If the astrologers could tell intelligence from a person’s horoscope, they would score close to forty hits out of forty. In fact the highest score was of
twenty-four hits by a single astrologer followed by twenty-two hits (by two astrologers). The remaining twenty-four astrologers all scored twenty hits or
less, including one professional astrologer who found thirty-seven intelligent and three undecided (so none were mentally handicapped!), of which seventeen
were correct. The average for all twenty-seven astrologers was 17.25 hits, less than the twenty expected by chance (e.g., coin tossing) and well within the
difference of ± 3.16 needed to be statistically significant at p=0.05. So much for the benefits of their average fourteen years of experience!
Certainly no scientific theory would survive such a poor success rate!
The institution whose team of astrologers had judged all 200 horoscopes got 102 hits, of which fifty-one were bright and fifty-one were mentally
handicapped, so their judgments were, again, no better than tossing a coin.
Tragically, our statistician, Sudhakar Kunte, died in an accident in 2011, and the security he imposed on data storage has so far made it difficult for us
to perform further tests, such as whether the astrologers agreed on their judgments, whether they could pick high IQ better than low, and whether the three
astrological methods used (Nirayan, Sayan, Krishnamurty) differed in success rate. We hope that the access to this data will eventually be possible.
Only two tests of Western astrologers have involved the judgment of intelligence. In Clark (1961) twenty astrologers averaged 72 percent hits for ten
cases of high IQ paired with cerebral palsy, but this famous result could not be replicated by Joseph (1975), where twenty-three astrologers averaged only
53 percent hits for ten cases of high IQ when paired with the severely mentally handicapped. In any case the sampling error associated with N=10
is more than enough to explain both results, which is consistent with the dozens of other tests that have been made of Western astrology (Dean 2007). It is
also consistent with the few tests of Western astrologers who practice Vedic astrology, for example Dudley (1995).
Our experiment with twenty-seven Indian astrologers judging forty horoscopes each, and a team of astrologers judging 200 horoscopes, showed that none were
able to tell bright children from mentally handicapped children better than chance. Our results contradict the claims of Indian astrologers and are
consistent with the many tests of Western astrologers. In summary, our results are firmly against Indian astrology being considered as a science.7
The Department of Statistics, Pune University, and the Inter-University Centre for Astronomy and Astrophysics, Pune, provided infrastructural support while
this experiment was being conducted. A brief account appeared in Current Science 96(5), 641–643, 2009. My special thanks to Geoffrey Dean of Perth, Western
Australia, for providing information on tests of Western astrology as well as giving me a general background of astrology in the West versus the East.
1. Babylonian omen ideas arrived in India around 450 BC during the Persian occupation, followed, around 200 AD, by Greek astrological ideas based on
planets. To these were added new ideas to suit Indian culture. The end result was largely the Indian astrology still in use today, which exists in numerous
schools disagreeing over details (most schools of astrology, Indian or Western, disagree over details). The main differences from Western astrology are a
preoccupation with reincarnation and karma, use of the sidereal zodiac instead of the tropical zodiac (they now differ by nearly one sign due to
precession), exclusion of the non-classical planets Uranus, Neptune, and Pluto in favor of the two lunar nodes Rahu and Ketu, use of twenty-seven lunar
mansions or nakshatras, and progressively smaller and smaller subdivisions of the signs (Stein 1995 and Rao 2000).
2. Braha (1986, xiii) warns that the complexity can be dealt with only by intuition and experience, so Indian astrology cannot be properly learnt from
books. But tests of Western astrologers have found that neither self-rated use of intuition nor experience raise their success rate above chance (Dean and
Kelly 2003). So why should Indian astrologers be any different?
3. At one time Rao ran a computer horoscope service but without predictions. It was “only to prove to ‘omniscient’ astrologers that a confirmed
anti-astrologer can also do what astrologers do, and with greater efficiency and knowledge.” His charge for fooling you was thirty rupees.
4. According to ancient Hindu texts, each believer has 8,400,000 rebirths from which they are released only by attaining enlightenment. At say, fifty years
per birth, and no change over time, the allocated rebirths span more than 400 million years, roughly the age of the earliest hominids.
5. More examples can be found in Premanand et al. (1993) and also via Internet search engine, albeit with a need to persevere in your searching. For
starters, try searching for “astrology michael prabhu.”
6. But some come close. For example Rakesh Anand (2010) used astrology to make several important decisions in his life, but the results were disastrous. So
he prepared horoscopes for twenty-four celebrities and nine personal friends, changed their names, and was able to get 101 astrologers from everywhere in
far northern India to predict their life and events. But none succeeded. For example, they predicted no political career from the horoscope of George Bush
and no big money from the horoscope of Bill Gates. He concluded, “astrology is a misleading and useless superstition” (6). He also offered a prize of one
million rupees (about $20,000) to any Indian astrologer who could demonstrate that astrology works, so far with no takers. For details, visit
7. Over the years I have made many public statements against the pseudoscience of astrology, which earned me a chapter titled “The Narlikar Episode” in a
348-page, 1998 book Astrology and the Hoax of “Scientific Temper” by the astrologer Gayatri Devi Vasudev, then editor of The Astrological Magazine. Her book tries to show that scientific inquiry or “scientific temper” is prejudiced against astrology, and that critics
are quite ignorant of both science and astrology. The above chapter accused me of venturing into areas I had not investigated and was therefore ignorant
of. For example, I had made the supposedly inexcusable mistake of declaring that astrology was not a science. I hope the present investigation can set the
Anand, R. 2010. Astrology Tested Fake. Jammu: God vs Life Publications.
Braha, J.T. 1986. Ancient Hindu Astrology for the Modern Western Astrologer. Miami: Hermetician Press.
Clark, V. 1961. Experimental astrology. In Search 3(1): 102–109.
Dean, G. 2007. The case for and against astrology. In B. Farha (ed.), Paranormal Claims: A Critical Analysis. Lanham, MD: University Press of
America, pp. 115–129.
Dean, G., and I.W. Kelly. 2003. Is astrology relevant to consciousness and psi? Journal of Consciousness Studies 10(6–7): 175–198.
Dean, G., A. Mather, and I.W. Kelly. 1995. Astrology. In G. Stein, editor, Encyclopedia of the Paranormal, Prometheus Books.
Dudley, J. 1995. An attempt to predict accidental death with Vedic astrology. Correlation 14(2): 7–11. (Twenty road deaths vs controls gave 11
hits vs 10 expected by chance.)
Joseph, R.A. 1975. A Vernon Clark-model experiment distinguishing exceptionally gifted high performance from profoundly retarded low performance children. Journal of Geocosmic Research 1(3): 55–72.
Komath, M. 2009. Testing astrology. Current Science 96(12): 1568–1572.
Premanand, B., M. Bhatty, and M.S. Risbud (eds). 1993. Astrology: Science or Ego-Trip? Published by Indian Skeptics. (The best single survey of
both Indian and Western astrology, impressively thorough, many anecdotes, but very few tests, none of them Indian.)
Raman, B.V. 1992. Planetary Influences on Human Affairs. New Delhi: UBSD.
Rao, S.B. 2000. Astrology Believe It or Not? Bangalore: Navakarnataka Publications.
Siddhanta, K. 2001. Some questions concerning the UGC course in astrology. Breakthrough 9(2): 1–36.
Stein, G. 1995. Encyclopedia of the Paranormal. Amherst: Prometheus Books. Entry on astrology.