New · Version 0.4.1 for Mac and Windows
Every chart, forecast and client report in one fast window, checked to a hundredth of an arc second.
Not sure which Mac you have? Choose Apple Silicon, the chip in most Macs from 2021 on.
The workspace
Charts
Scroll: a natal chart builds up layer by layer, then progressions and transits join it as a second and a third wheel.
Switch the same client from natal to transits, progressions, returns or a relationship chart. Drag the ring to look around.
Natal
Transits
Progressions
Solar arc
Multiwheel
Synastry
Composite
Davison
Solar return
Lunar return
Harmonic
Heliocentric
Classic style
Black and whiteNatalThe birth chart, in any of 11 house systems, tropical or sidereal.
Also: planet returns, Sun ingresses, relocated charts and the chart of the moment. Charts on this site belong to fictional people.
Inside 3suns
Fourteen parts of the program, shown as they are. The modules follow a consultation: the chart, what is coming, how to time it and where it plays out.
Put the transits around any chart and move through time by the hour, day, month or year, or press play. The contacts within a degree are listed beside the wheel and update as you go. Click a life event and the chart jumps to that day.
Synastry biwheels with every cross-aspect drawn and listed, both sets of positions side by side, and composite and Davison charts for the relationship itself. The Relationship report turns it all into text for your client.
Every transit, progression and direction as a bar from entering orb to leaving it, with each exact pass dated to the minute, including the three passes of a retrograde planet. Click an event to see its dates and orb curve, and open the chart for the exact minute.
The moving planets against the natal points on a 360°, 90° or 45° scale, for up to ten years at once. Where a line crosses a natal point, there is an aspect. The same events also come as a month calendar and as a dated list.
Annual and monthly profections, firdaria, zodiacal releasing from Spirit or Fortune to four levels, and primary directions in mundo and in zodiaco (Placidus semi-arc and Regiomontanus) with Naibod, Ptolemy, Cardan or true solar arc keys.
A full speculum with latitude, right ascension, declination, speed, azimuth and altitude. The almuten of every house cusp and main point, and the almuten of the chart after Ibn Ezra, with the prenatal syzygy and the planetary hour. Dispositors, receptions, Lilly's accidental dignities and antiscia sit on the same page.
Rising, setting, culminating and anti-culminating lines for each planet, parans and local space. Click any place to list the lines within 700 km and the parans on that latitude, and open the relocated chart there.
90°, 45° and 360° dials with a pointer you can turn and an outer ring of transits, progressions or solar arc. Midpoint trees for every point, the midpoint sort, and outer-ring contacts to natal midpoints.
Sidereal charts with Lahiri, Raman, Krishnamurti, Yukteshwar, True Chitrapaksha and other ayanamsas. Whole-sign houses from the lagna, nakshatras and padas, the sixteen Parashari divisional charts and Vimshottari dashas to three levels.
Stack conditions such as a Moon that is not void of course, a waxing Moon and Mercury direct, and 3suns lists every window when all of them hold at a place, with its length. Open the chart for any window. The same search runs across your chart files.
Positions, aspects and the written reading share one panel next to the chart. The reading starts with the core self, then takes each planet by sign and house and each aspect. Passages that an astrologer has not yet reviewed carry a Draft badge, so you always know what you are giving a client.
Eight built-in chart styles, from the clean 3suns wheel to a classic rainbow zodiac and a black-and-white print wheel. Switch on chart details, aspect glyphs, minor aspects, sign rulers or a table beside the wheel, and save the result as your own style. Print the wheel, copy it into an email, or save it as PNG, SVG or PDF.
Step the birth time by anything from a second to a day, or let it play, and watch the angles, the houses and the positions move. 3suns shows how far you are from the recorded time, and saves the new time when it fits.
Press ⌘K or Ctrl K and type a name, a place or a command. Open a client, jump to a module or start a report without leaving the keyboard. Your charts live in chart files with tags, notes and life events, and come in from other programs as AAF, CSV or JSON.
Client reports
Three written reports, exported as print-ready PDFs with your name, tagline, logo and colour on the cover. Choose a colour or a black-and-white wheel.
Accuracy
3suns calculates with the Swiss Ephemeris, the ephemeris professional astrology software relies on. More than 400 automatic tests run before every release.
| Point | 3suns | Reference | Difference |
|---|---|---|---|
| Sun | 26°56′14.79″ | 26°56′14.79″ | 0.00″ |
| Moon | 04°27′37.15″ | 04°27′37.15″ | 0.00″ |
| Mercury | 13°09′03.87″ | 13°09′03.87″ | 0.00″ |
| Venus | 18°54′08.46″ | 18°54′08.46″ | 0.00″ |
| Mars | 01°53′19.99″ | 01°53′19.99″ | 0.00″ |
| Jupiter | 11°26′02.35″ | 11°26′02.35″ | 0.00″ |
| Saturn | 08°58′16.10″ | 08°58′16.10″ | 0.00″ |
| ACAscendant | 16°12′24.94″ | 16°12′24.94″ | 0.00″ |
| MCMidheaven | 22°21′52.79″ | 22°21′52.79″ | 0.00″ |
The 3suns engine against swetest, the Swiss Ephemeris reference program, for a fictional chart.
It shows the sky right now, calculated in your browser while you read, and it agrees with the Swiss Ephemeris to within 14 arc seconds. The app itself is far stricter: every position is checked to 0.01″.
The full list
For astrologers coming from another program, here is the checklist.
Download
For Mac and Windows. No account needed. 3suns asks for your licence key the first time it starts, and your charts stay on your computer.
macOS 11 Big Sur or later
Not sure which Mac you have? Choose Apple Silicon. Signed by Karia LLC and notarized by Apple. Open the .dmg and drag 3suns into Applications.
Windows 10 or 11, 64-bit PCs and tablets
The Windows installer is not code-signed yet, so Windows SmartScreen may stop it. Click More info, then Run anyway.
3suns 0.4.1 is released under the GNU AGPL v3. Download the source code for 0.4.1
Questions
Macs with Apple Silicon or an Intel processor on macOS 11 Big Sur or later, and 64-bit Windows 10 or 11, which includes Windows tablets such as Microsoft Surface. There is no iPad or Android app yet.
Not sure which Mac you have? Choose Apple Silicon, the chip in most Macs from 2021 on. To check, open the Apple menu and choose About This Mac.
Yes. 3suns asks for a licence key the first time it starts, and a key works on one computer. There is nothing to sign up for. Until a key is entered you can look at charts, but you cannot create or change them or make PDFs. To get a key, write to .
Yes. Export your charts as an AAF file, the exchange format most astrology programs write, and import it into a 3suns chart file. CSV and JSON work too, and 3suns exports in the same formats.
On your computer, in the 3suns chart database. You don't need an account.
3suns uses the Swiss Ephemeris files for 1200 to 3000 AD, and a built-in analytical ephemeris outside that range. Positions and house cusps are tested against the Swiss Ephemeris reference program to 0.01 arc seconds, and time zones come from the IANA database, including historical changes and local mean time.
The report text is in English and the library keeps growing. Any passage that has not yet been reviewed by an astrologer is marked Draft in the app, so you always know what you are giving a client.
3suns is currently licensed under the GNU Affero General Public License v3, because it uses the Swiss Ephemeris under that licence. So the complete source code of every version we publish is available to download.
Yes, for now. The Windows installer is not code-signed yet, so SmartScreen does not recognise it. Click More info, then Run anyway. The Mac version is already signed and notarized.
