bhagolblog

Founder notes · The gist

Your birth details

The date, time and place of your birth work almost like a name for you, so the founder of an astrology company sets out the little his blog holds today, an email address if you subscribe, and the rules he has fixed for the birth data his future tool will need.

This is the short way in. The essay has the working, the sources and the sky.

A date, a time to the minute, and a town. Those three lines are about the most identifying thing a person can type into a form, not because of what they say about you but because of how few other people they leave standing next to you. In a city of 2 million, the number of others born on your date at your minute works out at less than a tenth of one birth.

He does the sums in the open. India has about 1.45 billion people and roughly 16 births a year per 1,000 people, which works out at about 55 births a minute across the whole country. He rounds the rate up to 20 on purpose, because a bigger number makes his own point weaker. Even then, once you narrow from the whole country to one city and one date and one minute, the crowd disappears.

Researchers in the United States found something similar without even using a time of birth. Latanya Sweeney worked with 1990 census data and reported in 2000 that three plain facts, sex, postal code and full date of birth, were probably enough to pick out 87 of every 100 Americans as one particular person. Philippe Golle repeated the work with newer census figures in 2006 and got 63 in every 100, and said honestly that he could not explain the difference. Either way, a few plain facts identify most of a country. A birth time recorded to the minute cuts those groups into as many as 1,440 smaller pieces.

That is why the free birth chart on so many astrology sites asks for a date, a time and a place, and then for a name, a sex and a phone number, which no calculation needs. The chart really is free and really is a chart. The record left behind is the point, and the most revealing thing in it is not the chart at all. It is the reason you came: a marriage, a child, an illness, money you are worried about.

Indian law does not treat any of that as special: the Digital Personal Data Protection Act, 2023 has no separate category for sensitive information.

So the blog collects an email address if you subscribe, and nothing else. No account, no password, no chart form. When the company builds its chart tool, it will ask for three fields and no more, in a separate part of the site with its own written terms, published before the first field goes live, and deletion on request. He will not invent the details he has not decided yet, such as how many days a deletion takes.

Words decoded

birth chart, or janma kundali (जन्म कुण्डली)
the diagram worked out from where the sun, moon and planets were at the moment somebody was born
birth rate
how many babies are born in a year for every 1,000 people
census
the government count of everybody in a country, published as tables of numbers
uniquely identified
picked out as one particular person, with nobody else matching
postal code
the short code for a delivery area, called a PIN code in India and a ZIP code in the United States
consent
your permission for a company to hold and use information about you, given for a stated purpose
sensitive personal data
a class some privacy laws use for information that needs extra protection, such as health records or fingerprints
deletion on request
you ask, they remove it, and they tell you it is gone
Why anyone should careYou can change a leaked password in a minute and a phone number in a week. Your date, minute and town of birth never change, and once they are in a company's database they can be matched against any other list that holds the same three facts. Rules about that are worth reading before you type them into a form, not afterwards.
Read it properly, 6 min Your birth details