Nine things about astrology that are simply not true

2026-09-15 · CosmicFlow

Some astrology myths come from bad science headlines. Others come from astrologers, and those are the ones worth correcting first. Here are nine claims that do not survive contact with the astronomy, the history, or the evidence.

The Sun was probably not in the sign your horoscope names

Start with the two biggest astrology myths, because they are really one myth wearing two hats.

The first is that your sign tells you which constellation the Sun was sitting in when you were born. Usually it does not. Western astrology uses the tropical zodiac, which is measured from the spring equinox, not from the stars. The Earth wobbles slowly on its axis, a motion called precession, and it takes about 25,800 years to complete one turn. Because of that wobble, the equinox point has drifted roughly 24 degrees away from the stars since the system was fixed about two thousand years ago. So a tropical Leo often has the Sun in front of the stars of Cancer.

Vedic astrology uses the sidereal zodiac, which is measured against the stars and corrects for that drift with an offset called the ayanamsha. This is why your Vedic sign is usually one back from your Western one.

The second myth is the periodic headline that NASA has added a thirteenth sign, Ophiuchus, and ruined everyone's identity. NASA did nothing of the kind. It published a children's explainer about constellations, which are uneven patches of sky of wildly different sizes. The zodiac is not those patches. It is twelve equal slices of 30 degrees along the Sun's yearly path. Nobody was ever measuring the ragged edges of constellations, so nobody lost a sign. If you want the actual definitions, our twelve sign profiles lay out what each 30 degree slice is taken to mean.

Mercury never moves backwards, and your laptop does not know the difference

Mercury retrograde may be the most repeated idea in modern astrology, and most people have the mechanism wrong.

Mercury orbits closer to the Sun than we do and moves faster. Three or four times a year it swings between the Earth and the Sun, overtaking us on the inside track. From our moving vantage point, it seems to slow, stop, and slide backwards against the background stars for about three weeks, then turn forward again. Think of passing a slower car on the highway: for a moment that car appears to drift backwards, though it is still going forward. Mercury is always going forward too. Retrograde is a trick of viewing angle, not a change in the planet.

The second half of the myth is the part sold hardest. Phones do not break more often during those three weeks. Flights are not delayed more. Contracts do not fail at higher rates. No one has shown any such pattern, and it would be easy to check if it existed, because airlines and banks keep very good records.

What happens is ordinary confirmation bias. When you have been told to expect trouble, you notice the dropped call and forget the ninety that connected. If the period is useful to you at all, it is useful as a personal reminder to reread the email before sending it. That is a habit worth having in any month.

There is no known force, and pretending otherwise is the worst kind of overselling

You will sometimes hear that planets affect us through gravity, magnetism, or mysterious rays. This is not true, and it is easy to show.

Gravity falls off with the square of distance and scales with mass. The gravitational pull of the doctor standing next to a newborn is larger than the pull of Mars, by a wide margin. The Moon does raise real tides in the ocean, because the ocean is a huge fluid body sitting under a close, massive neighbour. Your body is neither. The tidal force on a person from the Moon is far too small to move anything.

So what is left? Honestly, an unproven claim. Astrology says planetary positions correlate with human experience in a meaningful way, and correlation is what would need to be demonstrated. When it has been tested carefully, it has done poorly. The best known trial, published in Nature in 1985 by Shawn Carlson, gave astrologers real charts and personality profiles and asked them to match the two. They did no better than chance.

We compute charts from the Swiss Ephemeris, which is the same high precision planetary data used by astronomers. That means the positions we give you are right to a fraction of an arcsecond. It does not mean the interpretation attached to them is right. Accurate inputs are not proof of an accurate output, and anyone who blurs those two things is selling you something.

Manglik does not mean your marriage is doomed, and the rules disagree with each other

Now for the myths the astrology world itself keeps alive. The most damaging is Mangal Dosha, also called being manglik, which is the idea that Mars in certain houses of your chart makes you dangerous to a future spouse.

In the harshest version, told to frightened families every week, the marriage ends in early widowhood. There is no evidence for this. None. No study has found higher rates of widowhood, divorce or anything else among people born with Mars in those positions.

What is more telling is that the tradition cannot agree with itself. Some schools count Mars in houses 1, 4, 7, 8 and 12 from the ascendant, the sign rising in the east at your birth. Others add the second house. Others measure from the Moon, or from Venus, or from all three. Then come long lists of cancellations: Mars in its own sign, Mars aspected by Jupiter, both partners manglik, a birthday past a certain age. Depending on which book an astrologer opens, the same chart is a catastrophe or a non-event.

A rule that flips that easily is not a finding. It is a custom.

If someone has told you that you are manglik, it is worth seeing the actual placement for yourself. You can compute your free Kundli and look at where Mars really sits, in which house and which sign, instead of accepting a one word verdict from a stranger with a fee schedule.

A 36 point match score is mostly two Moon positions

Guna Milan, the 36 point compatibility score used across North India, is treated as a marriage test. It is worth knowing what actually goes into the number.

Every one of the eight categories, called kootas, is calculated from a single fact about each person: the nakshatra their Moon was in. A nakshatra is one of 27 star segments the sky is divided into, and the Moon passes through roughly one a day. That is the whole input. Two data points, one per partner.

So the score knows nothing about your Sun, your rising sign, where Venus or Mars sit, which houses are strong, or which planetary period you are each in. Two couples with identical scores can have completely different charts. And 15 of the 36 points come from just two categories, Nadi and Bhakoot, which sort people into three and twelve broad groups. Fail those two and a perfectly ordinary match drops below the customary threshold of 18.

No one has ever shown that high scoring couples stay together more often than low scoring ones. The score is a fast screening tool from an era when families matched strangers by post, and it was never meant to be the last word. Careful astrologers know this and look at the full charts of both people before saying anything.

Use it as a conversation starter if you like. Do not use it as a reason to end something that is working.

Gemstones and remedies are traditional, and tradition is not evidence

Walk into many consultations and you will leave with a shopping list: a yellow sapphire for Jupiter, a specific ritual, a donation on a particular weekday. Often the stone costs more than the reading.

The remedies are genuinely old and they sit inside a coherent system. Each planet has a metal, a colour, a stone, a charity. Inside the logic of jyotish, that all makes sense. But no one has shown that wearing a stone changes an outcome, and the claim is testable in principle. Nobody in the industry is racing to test it, which tells you something.

Two practical points. First, be careful when the urgency is manufactured. Real astrology does not come with a deadline that expires tonight. If a reading ends with a large fee to avert a disaster that was only revealed after payment, that is a sales technique, not a tradition. Second, no reading of any kind should ever replace a doctor, a lawyer or a qualified financial advisor. If an astrologer discourages you from seeking proper treatment or advice, stop the conversation there.

If a ritual gives you calm or a sense of agency during a hard stretch, that is a real benefit and worth respecting. Just be clear about what you are buying. A stone that helps you feel steady is doing psychological work, and there is no shame in that. A stone sold as a guaranteed fix for a marriage or an illness is a different thing, and the honest word for it is a false promise.

It is not five thousand years old and unchanged, and nobody can time your death

The last two myths are about authority.

The first is that Vedic astrology arrived complete in the Vedic age and has not changed since. The history is more interesting. The oldest surviving astronomical text, the Vedanga Jyotisha, is roughly 1400 to 1200 BCE and is mainly a calendar for timing rituals. It contains no birth charts. Horoscopic astrology, with twelve houses and a rising sign, appears in India in the early centuries CE, after contact with Greek astrology through trade. A key early text, the Yavanajataka, even says so in its name, which means something close to the Greeks' book of nativities. Borrowing is not a scandal. Every living tradition absorbs and reshapes.

It is still changing. Astrologers do not agree on the exact value of the ayanamsha, the offset between the tropical and sidereal zodiacs. The common systems differ by a degree or more, which is enough to move a fast placement into a different nakshatra. Anyone who tells you their school is the untouched original is overstating it.

The second myth is that a skilled astrologer can name the date of your death, or the sex of an unborn child. The classical texts do discuss longevity, and they also warn repeatedly about how unreliable those calculations are. Modern practice among serious astrologers is to refuse the question. Sex prediction is illegal in India for good reason, and no ethical practitioner will touch it. A chart is a map of timing and tendency, not a script with an end date written in.

Keep going

the twelve sign profilescompute your free Kundli