Lunar Return Chart: How It Is Calculated, 2027 Dates

The Moon goes once round the zodiac in a little over twenty-seven days, so it comes back to the longitude it held at any birth thirteen or fourteen times a calendar year. Each of those moments is a lunar return. This page finds them for one illustrative birth, by searching the site’s own Moon routine to well under a second, and then measures what changes from one return to the next: the interval, the time of day, the ascendant at New Delhi, and how much the answer moves with the zodiac, the city and the birth time.

What a Lunar Return Is

In modern Western practice a lunar return is the instant the transiting Moon reaches the exact ecliptic longitude it had at birth, and the lunar return chart is the horoscope cast for that instant at a chosen place. The tropical zodiac, counted from the March equinox, is the one Western astrology uses, and this page works in it first. Astrologers who work in the sidereal zodiac can apply the same definition to the Moon’s sidereal degree, with the Lahiri ayanamsa in this page’s case. It is the Moon’s counterpart of the solar return, which comes once a year; the Tajik form of that chart, the varshphal, is worked on the page about the varsh pravesh time.

Worked Example: Lunar Returns, October 2026 to December 2027

The illustrative birth is 15 August 1990 at 10:30 IST in New Delhi, the same example the varshphal page uses; it is not a real person. At that moment the Moon stood at 12°39′ Gemini in the tropical zodiac and 18°56′ Taurus in the Lahiri zodiac. The table lists every tropical return from 29 October 2026 to 31 December 2027, the interval since the return before it, and the tropical ascendant at New Delhi at that instant. Times are IST, cut to the whole minute. “Undecided” marks an ascendant within half a degree of a sign boundary.

The most recent return before this page was published came on 1 October 2026; the next will come on 29 October 2026 at 03:10. The first three rows are the last three of 2026, a year that holds fourteen returns for this birth, and the remaining thirteen are all the returns of 2027. The site’s Moon series is documented as good to about 10 arcseconds, which at the Moon’s slowest return speed in the census below is 20 seconds of clock time, so a printed time can be a minute off from software that uses a fuller lunar theory.

How Long From One Return to the Next

A tropical return comes back once per tropical month, the Moon’s circuit measured from the equinox. For this birth the census takes every return from the first, on 11 September 1990, to the last of 2050, on 26 December 2050: 807 returns and 806 intervals. The intervals average 27.32 days (27 d 7 h 43 min). The shortest was 27 d 5 h 21 min, ending on 22 March 1991, and the longest 27 d 11 h 33 min, ending on 21 December 1999, a spread of about 6 hours.

The Moon does not move at an even pace. At the 807 return instants it covers anywhere from 11.8° to 15.4° a day, and at the birth itself 14.3°; the Sun’s pull also reshapes its orbit a little from month to month, so no two circuits take quite the same time. The month that runs from new moon to new moon is a different period, about two days longer, because the Moon must also catch up with the Sun; the page on how long a lunar month lasts measures that one.

Thirteen or Fourteen Returns a Year

A calendar year divided by the mean interval is about 13.4, so every year must hold thirteen or fourteen returns, never twelve or fifteen. Over the 60 complete calendar years from 1991 to 2050, this birth has 38 years with thirteen returns and 22 with fourteen. Which years get fourteen depends on how early in January the first return falls: in the census the fourteen-return years all have their first return on or before 11 January, and the thirteen-return years all on 11 January or later.

Tropical and Sidereal Returns Are About an Hour Apart

A sidereal return is not the tropical one with a constant offset. The Lahiri ayanamsa grows by about 50″ a year; by mid-2027 it has grown 0.52° since this birth. To be back at its sidereal birth degree the Moon must therefore travel that much further than to reach its tropical one, so in every one of the 807 returns of the census the sidereal return comes later. At the thirteen returns of 2027 the lag is 50 to 55 minutes, varying with the Moon’s speed at the time.

The lag grows with age. For a second illustrative birth at the same clock time on 15 August 1977, fifty years before 2027, the ayanamsa has grown 0.70° by mid-2027, and its thirteen sidereal returns that year come 67 to 72 minutes after the tropical ones. In the hour or so between the two instants the New Delhi ascendant moves on 11° to 18° at the 2027 returns of the 1990 birth, so at four of the thirteen returns of 2027, the New Delhi ascendant at the sidereal instant is in a different sign from the one in the table. Averaged over the census, the interval between sidereal returns is 27.32 days, the sidereal month, longer than the tropical interval by about 7 seconds.

Why the Return Ascendant Jumps Round the Zodiac

Between two returns the Earth turns on its axis about 27.40 times against the stars. The whole turns bring the sky back to where it was; the fraction left over moves local sidereal time on by about 143° per return, a little over a third of a turn. The ascendant follows, but not evenly, because some signs need far longer than others to cross the horizon at Delhi’s latitude. Across the 806 intervals of the census, the New Delhi ascendant moves on by 93° to 222° from one return to the next, 143° on average. Counted in signs, it advances three signs at 90, four at 238, five at 236, six at 125, seven at 49 and eight at 1 of the 739 steps where both ends are clear of a boundary; four or five signs together account for 474 of them. It never stays in the same sign, and over the census it visits all 12 signs. The other 67 steps have an ascendant too near a boundary to call.

In 2027 the thirteen returns spread over six ascendant signs at New Delhi, with two undecided: Aquarius three times, Cancer twice, Sagittarius twice, Virgo twice, Aries once and Scorpio once. Aquarius is the commonest only because three returns land on it; there is no rule that repeats an ascendant month after month.

The City Changes the Ascendant, Not the Instant

The return instant is the same everywhere on Earth; only the clock reading and the ascendant change with the place. Mumbai is 4.3° of longitude west of Delhi and well to the south, and at the eleven returns of 2027 where both cities’ ascendants are clear of a boundary, Mumbai’s is in the same sign as Delhi’s every time. Kolkata is 11.2° east, which puts its local sidereal time about 11.2° ahead, and its ascendant is in a different sign from Delhi’s at five of eleven: 15 March (Sagittarius at Delhi, Capricorn at Kolkata), 26 August (Cancer at Delhi, Leo at Kolkata), 19 October (Aquarius at Delhi, Pisces at Kolkata), 15 November (Cancer at Delhi, Leo at Kolkata) and 13 December (Sagittarius at Delhi, Capricorn at Kolkata). Whether to cast the chart for the birthplace or for wherever the person is at the return is a choice the caster makes; the arithmetic shows only that the choice can change the ascendant sign.

How Much a Birth-Time Error Moves It

Every return is computed from the natal Moon, so an error in the birth time carries through. Moving this birth 10 minutes later moves the natal Moon on by 5.9′ of arc. The Moon then needs about as long to cover that arc at each return, so each 2027 return moves later by 9.7 to 10.5 minutes: a little less than 10 when the Moon is faster at the return than at birth, a little more when it is slower. Those minutes move the New Delhi ascendant on by 2.1° to 3.4°. For these thirteen returns that leaves every decided ascendant sign unchanged, but an ascendant a couple of degrees from a boundary would cross it.

Working Out Your Own Lunar Return

The site has no lunar return calculator, but the steps are short. First get the Moon’s position at birth. The Moon sign calculator prints it as a sidereal longitude, counted from 0° of sidereal Aries and cut to the arcminute, for the date, time and time zone you enter; how to find your Moon sign explains what the sign part of it is. For a tropical return, add the ayanamsa for the birth date, which the Lahiri ayanamsa page explains. Then find, in any table of Moon positions for the month in question, the moment the Moon reaches that longitude. One arcminute of the Moon takes 1.6 to 2.0 minutes of clock time at the speeds in the census, so a natal Moon cut to the arcminute pins the return to within about two minutes.

With the instant in hand, the ascendant calculator gives the ascendant for it at any listed city. It prints the tropical longitude of the ascendant beside the sidereal one, and each 30° of the tropical figure is one sign, counted from Aries. Its sign descriptions are written for birth charts and are not a reading of a return chart.

What This Page Does Not Give

A good deal of the writing on lunar returns is about what the chart is said to mean for the coming month, the return ascendant or the house the Moon lands in. That part is absent here, because a calculation can find when and where the Moon is back at its birth degree but has no way to test what anyone reads into that chart. The page also stops at the ascendant sign: house cusps would need a house system, and choosing one is a separate question. None of the dates above is offered as a good or bad time for anything.

In Brief

• Definition: the instant the Moon is back at its birth longitude; Western practice uses the tropical zodiac
• Interval: 27 d 5 h 21 min to 27 d 11 h 33 min in the census, 27.32 days on average
• Per year: thirteen or fourteen; 38 and 22 years respectively from 1991 to 2050 for the worked birth
• Sidereal against tropical: the Lahiri return comes later, by 50 to 55 minutes in 2027 for a 1990 birth and 67 to 72 for a 1977 one
• Ascendant: moves on 143° per return on average at New Delhi, never the same sign twice running
• Birth time: 10 minutes moves each return by about as much and its ascendant by 2.1° to 3.4°