What a Saros is
A Saros is 6,585.32 days — about eighteen years and eleven days — after which the Sun, Earth and Moon return to almost the same geometry. The interval is a whole number of synodic months (new moons), draconic months (node returns) and anomalistic months (perigee cycles) simultaneously, which is why the eclipses keep recurring.
Chain enough of those intervals together and you get a series: between sixty-nine and eighty-seven eclipses, each one a near-copy of the last, born at the same lunar node, starting as a grazing polar partial, swelling through decades of total and annular eclipses, then fading back to partials and dying. A series lives twelve to thirteen centuries.
NASA's Eclipse Web Site numbers every known series — one hundred ninety for solar eclipses, running from 1 to 190. Astrology has long treated your birth eclipse's series as a kind of lineage: the same family of shadows, repeating for everyone born under its members. This tool connects your chart to that numbering.
How this catalog was built — and checked
Most sites copy NASA's series tables. We could not, so we rebuilt them: the shipped ephemeris scanned every solar eclipse from 3400 BCE to 4500 CE, chained them on the Saros interval, and numbered each chain using the propagation rules NASA publishes on its periodicity page — where consecutive eclipses sit one, five or six lunations apart and each gap carries a fixed series-number step.
Anchored by a handful of dated eclipses with known series numbers, that rule set propagated to all three hundred four detected chains with zero conflicts and produced exactly NASA's canon: numbered series 1 through 190, nothing missing, nothing spurious.
The generator then hard-fails unless the result matches NASA's printed pages: Saros 1's first eclipse, Saros 117's full span and member count, Saros 139 and 145's anchors, Saros 178's profile, and the stated fact that thirty-nine series were active in 2008, numbered 117 to 155. All of it is re-verified inside probe B16 on every engine check.
What you get back
Cast the chart and the report shows:
- The nearest solar eclipse to your birth — its date, type and how many days from your chart — and the Saros series that hosts it.
- Your eclipse's generation in the family: which member of how many, what percentage through the series, and whether it sits in the early partial, mature central or fading phase.
- The series' lifespan, member count and lunar node, plus a table of its twins: the one-Saros neighbours before and after, and the triple-Saros Exeligmos siblings.
How to read your result
Start with the member number. A birth near an eclipse early in its series — member ten of seventy-one, say — sits with the family while it is still forming at the poles; a middle member is the mature, central-eclipse generation; a late member watches the series die. Tradition reads that arc as a theme unfolding across the family's generations.
Then look at the twins. The member one Saros before your eclipse fell almost exactly eighteen years and eleven days earlier on Earth; the Exeligmos three Saros away returned a similar shadow to nearly the same longitude. If you know an older relative born near one of those dates, you share a series.
Finally, keep the two layers apart. Which series holds your nearest eclipse is arithmetic against a verified catalog. What an eclipse family is said to signify is symbolism — a Babylonian-inherited lore — and this page labels it as such throughout.
Worked examples with real numbers
A birth at 17:30 in London on 1 January 2000 has its nearest solar eclipse on 5 February 2000 — a partial, thirty-five days after the chart. That eclipse is member sixteen of seventy-one in Saros 150, a descending-node family running from 24 August 1729 to 29 September 2991.
Berlin, 12:30 on 15 July 1990: the nearest solar eclipse is the total of 22 July 1990, member forty-six of seventy-two in Saros 126 — descending node, born on 17 March 1179, dying on 3 May 2459. Middle of the family's life, and middle of its central-eclipse phase.
Sydney, 09:00 on 20 March 1988 lands on the famous one: the total solar eclipse of 18 March 1988 is member twenty-eight of seventy-one in Saros 139 — the same ascending-node series as the 8 April 2024 North American total, member thirty of the family. Two eclipses, thirty-six years apart, one lineage.
Saros 139 itself spans 27 May 1501 to 3 July 2763 — twelve and a half centuries of near-identical geometry — and both your Sydney eclipse and the 2024 total are links in it.
What living in a series has been thought to mean
The Babylonians recorded the Saros on clay tablets three thousand years ago; every culture that watched eclipses found the rhythm. Astrological tradition extends the pattern into narrative: eclipses of one series are treated as chapters of one story, each member replaying its predecessor's themes under different skies.
What is objectively true is tighter and stranger. The geometry really does repeat — same node, same season, almost the same Moon size — while the shadow falls a third of the way around the Earth each time. You do not need to believe the story to notice that your birth eclipse has ancestors and descendants with matching shapes.
Saros against the other eclipse clocks
The Saros is the famous cycle, but NASA's periodicity page lists neighbours the catalog generation also used: the Inex (three hundred fifty-eight lunations, the family-swapper behind eclipse cycles like the one this site's lore tools mention), the Tritos (one hundred thirty-five lunations, a monthly cousin) and the Exeligmos (three Saros, which reprints the shadow over the same ground).
Each series here is solar-only. The Moon's eclipses form their own parallel Saros families, numbered separately — different geometry, different catalog — and this tool deliberately reports the solar one, because in natal tradition the new moon eclipsing the Sun is the eclipse that 'counts' for a birth.
What this tool does not claim
Dating conventions differ. NASA quotes pre-1582 series members in the Julian calendar and in dynamical time, so its printed dates differ from our proleptic-Gregorian, universal-time catalog by ten to twenty-four days in old eras; we verified our Saros 1 and 117 spans against NASA's pages after converting calendars. Our member counts can also run one or two eclipses longer at a series' faint polar tails.
There is no tested evidence that a birth near an eclipse — of any series — shapes a life. The astronomy is verified end to end: probe B16 checks the catalog's contiguity, node parity and NASA anchors. The meaning layered on the family line is tradition, presented as tradition.
Our method in one line
Nearest solar eclipse to the birth instant from the shipped ephemeris, resolved by date window into a catalog of 190 series numbered by NASA's interval-propagation rules and verified against NASA's published series pages; eclipse predictions credited to Fred Espenak (NASA's GSFC) and Jean Meeus. Reviewed by Dr. Amara Osei, Astronomy Reviewer.
Step by step
- 1
Enter your birth data
Date, time and place. The search window is ±400 days, so you do not need to be near an eclipse to get an answer — everyone has a nearest solar eclipse.
- 2
Read the series card
The number, lifespan, member count and node tell you which family your eclipse was born into and how old that family was at the time.
- 3
Find your generation
Your member position in the series marks whether your eclipse came in the family's youth, its mature central phase, or its decline.
- 4
Check the twins
Compare dates with relatives born eighteen years either side — same series, same geometry, one generation apart.
Frequently asked questions
- What exactly is the Saros cycle?
- Six thousand five hundred eighty-five and a third days: the shortest interval that is simultaneously a whole number of new-to-new moons, node-to-node returns and perigee-to-perigee cycles. After one Saros the Moon shadows Earth again in nearly identical geometry, one-third of the way around the globe — which is why eclipses come in numbered families rather than singly.
- How do I find my Saros number?
- Take the solar eclipse nearest your birth and look up which numbered series contains it — this tool does both steps from your birth data, using a catalog this site built and validated against NASA's published series pages. Published tables and Wikipedia list the same numbers for recent eclipses; 2024 April 8 is Saros 139, member thirty.
- Does my nearest eclipse have to be the one I was born on?
- No. Births within days of an eclipse are rare, so the tool reports the closest solar eclipse within about a year and a half either side, and shows the distance in days. Tradition generally treats eclipses within weeks of a birth as active; the window here is deliberately wider so every chart gets a family, and the gap is printed so you can weigh it yourself.
- What does odd or even mean in a series number?
- In NASA's numbering, odd series begin at the Moon's ascending node and even ones at its descending node — a structural fact of the catalog, not a judgment. It shows up in our data as a perfect parity rule, which is one of the checks probe B16 runs: every odd number walks north to south, every even number south to north.
- Is this catalog just copied from NASA?
- No — it is regenerated from this site's own ephemeris, numbered by the propagation rules NASA documents, and the build fails unless the result reproduces NASA's published spans and counts for series 1, 117, 120, 139, 145 and 178 plus the thirty-nine series active in 2008. We credit Eclipse Predictions by Fred Espenak of NASA's GSFC and Jean Meeus, whose free-reproduction policy made the verification possible.
Written by
Elena Marchetti
Founder & Staff Astrologer
Methodology reviewed by
Dr. Amara Osei
Astronomy Reviewer
Published 2026-10-03 · Updated 2026-10-03 · Calculated with sub-arcsecond astronomy (VSOP87/ELP via astronomy-engine)