The Astrolium lunar return calculator gives you the full chart for any monthly lunar return: the moment transiting Moon returns to its natal degree. The Moon's cycle is 27.32 days, so the return arrives about 13 times per year. Math runs on the Swiss Ephemeris in under 30 seconds. No login, no email, no upload.
For the year-frame technique that sits above it, see the solar return chart calculator. For the annual time-lord structure that gives the lunar return context, run the profections calculator. The full integrated view, where lunar returns stack against solar returns, transits, and profections on one ribbon, lives inside the predictive timing feature.
What you get
The technique
The Moon returns to its natal degree every 27.32 days. That moment, the lunar return, is treated as the chart for the month ahead.
Not a full solar chart. Not a transit snapshot. It's a chart cast for the return moment, read like a natal chart but with a shorter shelf life. The planets at that moment show the emotional weather of the coming month: which houses are activated, which planets are strong by angularity, which aspects are building.
The technique is old. Guido Bonatti described it in the 13th century. It ran in parallel with the monthly distribution technique in Hellenistic and medieval practice. Modern practitioners revived it via Abu Ma'shar and the translation work of Robert Zoller and Benjamin Dykes. Today it circulates mostly among practitioners who work the full predictive stack: solar return for the year, profections for the year-lord, lunar return for the month.
Reading the monthly chart
The Moon's house placement in the return is the first thing to read. Moon in the 1st: the month is about the person, their body, their presence. Moon in the 7th: relationship or partnership takes the foreground. Moon in the 10th: public work or career. Moon in the 4th: home, family, private life.
Angular planets are next. Any planet on or near the four angles of the return chart (Ascendant, Midheaven, Descendant, IC) carries extra weight that month. A Saturn on the Descendant of a lunar return often marks a month with a heavy relational commitment, a difficult conversation, or a structural demand from another person. A Venus on the Ascendant marks a month where the person is seen more, sometimes in a flattering light.
The return Ascendant itself matters. If the lunar return Ascendant is the same sign as the natal Ascendant, practitioners note the month as one where the person's core themes resurface more directly than usual. If the return Ascendant activates a natal house cusp, the area of life associated with that house often moves.
Aspects from the return chart to the natal are read selectively: only close applying aspects (under 2 degrees) to natal angles, natal luminaries, and the natal ruler of the Ascendant.
Precession and the natal degree
The Moon's natal degree is computed from the natal chart. Astrolium pins it to the arc-second using the Swiss Ephemeris DE431, the same library Solar Fire uses under the hood. This matters because the Moon moves roughly 13 degrees per day. A 10-minute error in birth time shifts the natal Moon by 2 degrees, which can push the return moment forward or back by several hours and change the return Ascendant.
Astrolium flags the natal Moon's degree at the top of the result, so you can verify before reading the chart.
How to use it across a month
The lunar return chart is the overlay, not the full reading. Run it alongside the solar return for the same year and the profections calculator for the same birthday. The profected house sets the year's theme. The solar return shows the year's structure. The lunar return shows what the current month is asking.
A client whose profected year activates the 7th house, whose solar return has Saturn in the 7th, and whose current lunar return has Moon in the 7th is having a relationship month, in a relationship year, in a relationship season. That stacking is when the technique earns its keep.
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Cross-link
Pair the lunar return with the solar return chart calculator for the year-frame view, and the profections calculator for the year-lord. For the timing layers that place the month in a longer arc, see predictive timing. For related return techniques, see the Jupiter return calculator, Saturn return calculator, and Venus return calculator.