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Solar Return Calculator

The exact moment the Sun returns to its natal longitude, and the chart for that moment. Calculated in your browser with Swiss Ephemeris, no sign-up.

What a solar return is

A solar return chart is cast for the moment transiting Sun comes back to the exact longitude it held at birth. That moment happens once a year and almost never coincides with midnight on the birthday: it drifts by several hours and rolls back after a leap year. The chart of that moment describes the year from one birthday to the next.

Why the date shifts every year

A tropical year lasts about 365 days 5 hours 49 minutes, while a calendar year has 365 or 366. The difference accumulates, so the return moment moves roughly six hours forward each year and jumps almost a day back after a leap year. This calculator does not round to a day: the moment is found by bisection against Swiss Ephemeris to within a second, and the chart is built from it.

Which location to use

Planetary positions in a solar return do not depend on location, houses and the ascendant depend on it entirely: the same instant gives different cusps in Kyiv and in Lisbon. The classical approach uses the birthplace, the relocation approach uses wherever the person physically meets the moment. Both are available here: the birthplace is the default, the checkbox switches to another city.

Where to start reading

Start with the solar return ascendant and its dispositor, then the house holding the Sun: it shows where the year's attention goes. Next come planets on the angles, which tend to be felt as outside circumstances. Read the aspects against the natal chart: a repeated natal configuration amplifies an old theme, a new one introduces a storyline that was not there before.

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Natal Chart Online →Planetary Transits Online - Calculate Free →Today's Astrological Forecast →

How the return moment is found here

The natal chart is calculated first and the Sun's longitude taken from it. The calculator then steps day by day around the requested year to find where the transiting Sun is closest to that longitude, and refines the instant by bisection: the interval is halved fifty times until the difference falls below a second of time.

Everything runs in the browser on Swiss Ephemeris compiled to WebAssembly. Your birth data is not sent anywhere: the only request to the server asks for the time zone of the given coordinates and date, so the moment can be shown in local time.

  • •the moment is accurate to a second, not to a day
  • •shown both in the local time of the chart location and in universal time
  • •houses use Placidus, the same default as the natal chart

Solar returns and relocation

The question of where to spend a birthday comes from a plain property of the chart: the angles depend on location, and half an hour of longitude already moves the cusps. So a relocated return is checked by which planets land on the angles in each option, not by impression.

A practical order: calculate the return for the birthplace first to see the baseline year, then for the city you will actually be in. If the second chart puts a difficult planet on an angle, that argues against the trip, and the reverse argues for it.

Common mistakes

The most frequent one is casting the return for the calendar birth date without refining the moment. The second is interpreting the houses when the birth time is unknown: the moment still means something, the cusps do not.

The third is reading the return apart from the natal chart. A solar return does not override the natal chart and adds nothing that is not in it: it shows which part of the natal chart is emphasised this year.

Solar return questions

Is a solar return cast for the birth date or the exact moment?
For the exact moment of the Sun's return. Using midnight on the birthday shifts the ascendant and the houses almost every time, and those carry most of the interpretation.
Do I need an exact birth time?
For the moment itself, barely: the Sun moves about 2.5 arcminutes per hour, so an hour of error shifts the return by minutes. For the houses you do need it, because the natal solar longitude sets the reference point and the difference is visible on the cusps.
How long does a solar return last?
From one solar return to the next, about a year. Some schools additionally split that year into lunar returns, calculated the same way for the Moon.
What if I am abroad on my birthday?
Calculate both. The relocated return shows the circumstances of the place you will actually be in, the birthplace return shows the line running from birth. Comparing the angles of the two charts is usually the answer to whether travelling for a birthday is worth it.
How is a solar return different from transits and progressions?
Transits are the current sky and change daily. Progressions are a symbolic motion of the chart. A solar return is one chart for the whole year, a snapshot of the sky at the solar moment: it reads as the frame of the year, inside which transits supply the dates.
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