Solstaria

Your birth chart, drawn plainly.

Enter where and when you were born. Solstaria works out the sky over that exact spot at that exact moment, and draws it plainly enough to read.

Draw my chart Tonight’s sky

Free, with no account. It is worked out in your browser, and nothing you type leaves this device.

Start with your birth details

Date of birth
Time of birth

Nothing you type is sent anywhere. The chart is worked out in your browser and kept on this device.

Three things most free charts get wrong

The time zone your city actually used

Clocks have not always followed today’s rules: summer time began and ended on different dates, and some places changed time zone altogether. Solstaria looks up the offset in force on your birth date, in your birth city.

No ascendant when the time is unknown

Houses and the rising sign move roughly a degree every four minutes. Without a birth time they cannot be known, so we leave them out rather than print a guess you would take seriously.

Compatibility as five readings, not one number

A single percentage tells you nothing you can act on. Two charts get compared across attraction, conversation, daily life, values and friction, and each one is explained.

Everything on Solstaria

55 tools and readings, each worked out on your own device. Start anywhere; each one leads on to the next.

Questions people ask

What is a birth chart?

A birth chart is a map of the sky for the minute and the place of a birth: where the Sun, the Moon and each planet stood along the zodiac, which angles they made to one another and, when the time is known, which sign was rising in the east and how the sky falls into twelve houses. Astrology reads each placement as describing a side of a person’s character. Solstaria calculates the positions in your browser from an astronomical library.

What do I need to make my birth chart?

The date, the time and the place of birth. The date places the Sun and the planets, the place gives the latitude and the time zone in force that day, and the time settles the Moon’s exact degree, the rising sign and the houses. If the time is not known, tick Birth time unknown and the chart is drawn without a rising sign or houses. There is no account to make, and nothing you enter is sent anywhere: the chart is worked out in your browser and the details stay on this device.

How do I read my birth chart?

Begin with three placements: the Sun’s sign, the Moon’s sign and the rising sign. Then take the planets one at a time. Each is read by its sign, which describes the manner in which it acts, and by its house, which names the part of life it is read as turned towards. Aspects, the angles between planets, describe how two of them work together. On the chart page, pointing at a planet gives its degree, sign and house and picks out its aspects, and the tables underneath set out every position.

Why does my rising sign need a birth time?

The rising sign is the sign on the eastern horizon at the moment of birth. As the Earth turns, the whole zodiac passes over that horizon once a day, so the rising degree moves quickly: twenty minutes can shift it by several degrees, and an hour or two can change the sign. The houses are counted from the same point, so they depend on the time as well. Without a birth time there is nothing to set them from, and Solstaria leaves the rising sign and the houses out rather than show ones that could be wrong.

Why does the time zone of my birth place matter?

A birth certificate records the local clock time, but the planets are placed by universal time, and the gap between the two has not stayed fixed. Summer time has begun and ended on different dates over the years, and some places have changed zone altogether. An offset out by an hour moves the rising degree by about fifteen degrees. Solstaria uses the offset in force in your birth city on your birth date, and if the clocks went back that night and your time came round twice, the chart page asks which one you mean.