What Is a Purple Star Chart, and Why Your Birth Hour Matters

Same date, different hour, different chart

Two people born on the same day, two hours apart, almost never get the same Purple Star chart. The tradition divides the day into twelve two-hour periods, and the period you were born in sets the chart’s starting point. Move to the next period and the whole layout moves with it, even though the date has not changed. That is why the chart asks for your birth time and birth city, and why it shows exactly how it used them.

Purple Star astrology is a traditional Chinese way of drawing a birth chart, handed down through several schools that disagree about some placements. It takes its English name from the star that anchors the layout, which our chart labels the Sovereign. Its vocabulary is a set of symbols for areas of life and ways of acting. PracticeEco draws the chart with one fixed set of rules and shows it beside a separate set of 24 questions you answer about yourself.

Twelve palaces and fourteen major stars

The chart is a ring of twelve palaces, and the full chart on your result lists them under “Your twelve palaces”. Each palace is a heading for one area of life: Self, Siblings, Partner, Children, Wealth, Health, Travel, Friends, Career, Home, Inner Life and Parents. One of them is your Life palace, the area the chart reads as your self. It carries the Self label, and the other eleven follow it around the ring in a fixed order.

Fourteen major stars are then placed into those palaces: Sovereign, Strategist, Beacon, Marshal, Peacemaker, Reformer, Treasurer, Keeper, Wolf, Questioner, Minister, Elder, Warrior and Breaker. Six are placed from the Sovereign and eight from the Treasurer, which mirrors it. A palace can hold one or two major stars, or none. The English names are our own short labels for the traditional stars, not literal translations, and each star has its own page if you want to look one up.

Why the birth hour decides the chart

Your birth hour and the lunar month together fix the Life palace. The element phase is read from the Life palace, the Sovereign is placed from the element phase and the lunar day, and the other thirteen major stars follow from the Sovereign. So the hour sits at the start of the whole chain. Move the birth time into the neighbouring two-hour period within the same lunar day and the Life palace moves one step, every palace name moves with it, and the stars can land in different palaces too. Your chart type, which is read from the Life palace, can change as well.

The period is read from the sun, not from the clock on the wall. Clock time follows a time zone that can be hundreds of kilometres wide, and daylight saving moves it again, while the sun reaches its highest point over each city at a slightly different moment. That is why the chart asks for your birth city as well as your birth time, and converts your clock time to solar time for that city before anything is placed.

The Beacon and the Keeper: the sun star and the moon star

In the classical text, one of the fourteen stars is the essence of the sun, and another, the moon star, is the essence of water and the sun’s partner. Our chart labels them the Beacon and the Keeper, the sun of the chart and the moon of the chart. Every chart has both, each in one of its twelve palaces.

Present-day teaching commonly reads them as a pair of symbols: the Beacon for the outward side of a person, what they show, give and do in the open, and the Keeper for the inward side, what they hold, store and tend in private. That reading is a modern one. The classical text names the two stars and pairs them, but it does not put them in these words.

They are read together, not one over the other. Neither is the better star, and a reading that looks at one without the other sees half the picture. On a chart, a useful question is simply where each one sits: which area of life the outward symbol is placed in, and which area holds the inward one. That is a prompt for noticing, not a statement about what you are like.

Why our chart can be checked

A chart is only worth reading if you can see how it was made. Here is what you can check on ours.

Local solar time. Your birth time and birth city are converted to local mean solar time for that city, at four minutes for every degree of longitude. A birth at 12:00 on a summer clock in Los Angeles, for example, is read as 11:07.

It shows its working. Open the full chart on your result and it prints the clock time and time zone you entered, the longitude used, the converted solar time, and the lunar date and two-hour period the chart was drawn from. You can redo the arithmetic yourself and check the lunar date against a public calendar table.

Same input, same chart. The rules are fixed and versioned, and nothing in the calculation is estimated or random, so the same birth details give the same chart every time.

No guessed birth times. If you do not know when you were born, the page does not invent a time. You can choose to use your whole birth date instead: it then draws a candidate chart for each two-hour period of that day, and you choose which one to look at. It never picks one for you, and comparing candidate charts cannot establish your birth time.

Named types. The fourteen major stars are placed in the twelve palaces, and your chart type is named after the major stars in your Life palace, or after those in the opposite palace when the Life palace holds none. That gives 38 chart types, each with its own page.

Two separate views. Your chart and your answers to the 24 questions are shown side by side as two separate sources. They are never used to confirm each other, so agreement between them is not evidence and disagreement is not a mistake.

Calculated in your browser. The chart is worked out in your browser, and you do not need to sign up, give an email address or pay to see it.

A cultural framework, used for noticing

Purple Star astrology is a cultural framework: a vocabulary one tradition built for talking about a life, area by area. Read it as that. It cannot see your circumstances, measure your character or tell you what comes next, and our chart does not pretend to. What it can do is give you a structured set of headings to look at your own life through.

To use it as a tool for self-observation, pick one palace or one star on your chart, note what its symbol points at, and look for a recent, specific moment in your own week that fits it, and one that does not. Keep both. Then set them beside your answers to the 24 questions, which come from somewhere else entirely, and see where the two views meet and where they part.

• Which palace on my chart names an area I want to look at more closely this week?
• Where did the outward side or the inward side show up in something I did recently?
• Which recent moment does not fit the symbol at all, and what does that tell me?

Sources and scope

Editorial draft 17 October 2026. Original editorial writing; editorial status is not expert or clinical review.

• Hong Kong Observatory: Gregorian–Lunar Calendar Conversion Table — It shows its working: a public table, 1901 to 2100, for checking the lunar date printed on your result.
• NOAA Global Monitoring Laboratory: General Solar Position Calculations — Local solar time: solar time is offset from clock time by four minutes for each degree of longitude, measured against the time zone. Our chart uses mean solar time, without the small seasonal correction this document adds.
• The Complete Book of Purple Star Astrology, volume 1 (classical text in Chinese, Wikisource transcription) — The sun star and the moon star: the classical text calls one the essence of the sun and the other the essence of water, paired with the sun. It does not describe them as outward and inward; that reading is present-day teaching.

The source list supports specific background statements. It does not validate PracticeEco’s traditional chart or original self-reflection as a psychological test.