The Astrolium solar return chart calculator gives you the annual return wheel for any year, cast for the exact moment the transiting Sun returns to its natal longitude. Your solar return chart is the astrological forecast for the year ahead, with house emphasis, angular planets, and aspect patterns that frame the next 12 months. Math runs on the Swiss Ephemeris in under 30 seconds. Tropical or precession-corrected. Relocated to any city. No login, no email, no upload.
The return moment is rarely on your birthday clock time. The tropical year is 365.2422 days, so the Sun's exact return drifts by roughly six hours per year. The calculator pins the moment to the arc-second, which matters because the Ascendant moves about one degree every four minutes.
The full reading sits inside the solar return feature, where the wheel pairs with the profected year-lord and a 12-month transit overlay. For the interpretive framework, read the solar return guide. For the sibling monthly technique, see the lunar return feature. For the $29 per month Pro tier, see pricing.
What you get
A solar return is cast for the moment the transiting Sun returns to its natal longitude, roughly your birthday but accurate to the minute. The tropical year is 365.2422 days, so the return rarely falls on the same clock time as your birth. Often it's the day before or the day after, hours off, occasionally even a different calendar date.
That precision matters because the angles change minute by minute. The Ascendant of a return cast at 09:14 will be different from one cast at 09:23. The house emphasis of the year hangs on those minutes. Astrolium pins the moment to the arc-second.
Tropical or precession-corrected
The contemporary working field is split. Liz Greene and most psychological astrologers cast the return in the tropical zodiac, no adjustment. Bernadette Brady, Raymond Merriman, and the sidereal-anchored school argue for precession correction: adjusting the return so the Sun is at the same sidereal degree it occupied at birth, not the same tropical degree.
The difference compounds at roughly 1.4 degrees per century. A client born in 1980 has a precession-corrected return that lags the tropical return by about 36 minutes. A client born in 1955 has one that lags by 50 minutes. The Ascendant of a precession-corrected return can be a different sign than the tropical return, which means the entire house structure of the year changes.
The calculator ships both. Toggle from the dropdown; the wheel recasts in real time.
Relocated solar returns
Cast the return for any city other than the birth city. The houses change dramatically because the angles depend on location. A client spending the year in Tokyo will get a different Ascendant, and a different house emphasis, than the same person spending it in São Paulo.
Mary Shea's work in the 1990s formalized the relocated solar return as standard practice. Most working astrologers offer it as part of an annual reading when a client knows where they'll be for most of the next 12 months. Astrolium lets you cast it without re-entering birth data: just type the return location into the form.
How the calculator works
Drop the natal data (date, time, place) plus the target year and optionally a relocation city. The math runs in your browser on the Swiss Ephemeris, the same library Solar Fire and Astro Gold use under the hood. Absolute positions match to the arc-second across 1900 to 2100.
Tropical method is the default. Toggle to precession-corrected from the dropdown; the wheel recasts instantly. Whole-sign and quadrant house systems both supported; the chart settings in the predictive workspace let you switch without re-entering birth data.
Nothing is stored. Nothing is emailed. We don't know who you are.
After the calculator
A solar return is not read alone. The Hellenistic tradition pairs it with the profected year-lord: the planet ruling the house that activates this birthday. Year 30 sits in the 7th house, ruled by whatever planet rules your 7th. The solar return then sits inside the larger frame of that house and that planet. Find the year-lord with the profections calculator, then read the return inside it. For the interpretive framework behind this pairing, see the solar return guide.
The reading also hangs on transits to the return chart. Every outer-planet transit hitting the return points across the next 365 days becomes the timeline of the year. A Pluto square to the return Ascendant in month 7 is when the year's structural pressure peaks.
The full workspace stacks all three layers (the return wheel, the profected year, the 12-month transit overlay) on one screen. See the solar return feature for that workspace.
For the deeper reading method (how to read the return's Ascendant, what an angular Saturn means for the year, how to weight the precession-corrected method against the tropical) see the solar return guide. For practitioners running solar returns across a roster, the pricing page covers the $29 per month Pro tier.
Cross-link
Run related timing techniques: profections calculator, Saturn return calculator, Jupiter return calculator, progressed chart calculator. For the predictive feature stack, see predictive timing and the solar return feature.