Does the Market Drop at Least 2% When Mercury Goes Retrograde? We Tested All 242 Since 1950
The claim: expect a ~2% drop in the days after Mercury stations retrograde — and watch out again at the midpoint. The examples are unforgettable: Mercury stationed retrograde the Friday before Black Monday 1987 and three days before the COVID crash began. So we tested every station and every midpoint since 1950, with a chart for each one. The anecdotes are real. The pattern is not.
The Conclusion
Mercury stations do not precede 2% drops any more often than random days do. A 2% five-day drop followed 17.8% of the 242 stations — against an 18.2% base rate for any trading day. The midpoints scored 17.4%. The claim's bar is met by nearly one random day in five, which is exactly why it feels confirmed so often.
2% drops are ordinary weather. 18.2% of all 19,252 trading days since 1950 were followed by a close-to-close drop of 2%+ within five days (26.6% measured to the intraday low). A rule that fires three times a year collects “hits” by chance alone.
No threshold, no event, no measure beats chance. We tested drops of 1%, 1.5%, 2% and 3% after the station retrograde, the midpoint, and the station direct — measured both to the lowest close and to the lowest intraday wick. Twenty-four cells; not one survives correction for the twenty-four ways we looked.
The anchors are spectacular — and cherry-picked by memory. Black Monday came one trading day after the October 16, 1987 station (−20.5% in five days). The COVID crash began three days after the February 16, 2020 station. Those are 2 of 242. The five days after the current retrograde's station (June 29, 2026)? The market rose 0.85%.
The midpoint leans the other way, if anything. The five days after the midpoint averaged +0.35% — better than the unconditional +0.18% — and produced fewer 2% drops than random days. If Mercury's heart were a trapdoor, the floor is oddly springy.
Everything below is how we got there — the definitions, the base rates, the full grid, and an interactive table of all 242 retrogrades where you can open the chart for every station and every midpoint and check us.
The Claim
Three times a year Mercury appears to stop against the stars and reverse course — the station retrograde. About eleven days later it passes directly between Earth and the Sun (the midpoint, or inferior conjunction), and roughly eleven days after that it stations direct. In astro-trading circles the station is the classic danger date: communication breaks down, markets wobble, expect a sharp drop — commonly quoted as “about 2%” — in the days that follow. A second version of the claim attaches the drop to the midpoint instead.
This claim earns its staying power honestly: Mercury stationed retrograde on Friday, October 16, 1987 — Black Monday was the next trading day. It stationed on February 16, 2020, three days before the COVID crash began, and on January 14, 2022, right at the top before that year's bear market. Three unforgettable coincidences. The question a chart can't answer is the one that decides everything: how often does the same drop follow an ordinary Tuesday?
The Test
We computed every Mercury retrograde from 1950 to 2026 with a Swiss Ephemeris (242 of them), snapped each station and midpoint to its nearest S&P 500 trading day, and asked: did the index close at least 2% below the event day's close at any point in the next five trading days? Then the crucial step — the control: what share of all 19,252 trading days pass the exact same test?
43 / 242
Stations followed by a 2% drop within 5 days (17.8%)
18.2%
Share of ALL trading days that pass the same test
The base rate: one random day in five “predicts” a 2% drop
Nearly a fifth of all trading days since 1950 saw the S&P 500 close 2% lower within the following five sessions. Fire any rule three times a year for a decade and chance alone hands you five or six confirmed “Mercury drops” — no astronomy required. The stations, at 17.8%, actually collect slightly fewer than a dart board would.
Every Threshold, Every Event
Maybe 2% is the wrong number, or the station is the wrong anchor. So we ran the full grid: four drop thresholds, after all three events of every retrograde. Hit rates that beat their base rate are rare, small, and exactly as frequent as chance predicts.
| Drop within 5 days | Any-day base rate | After station retro | After midpoint | After station direct |
|---|---|---|---|---|
| ≥1% | 36.9% | 38.4% | 34.0% | 36.9% |
| ≥1.5% | 26.3% | 26.4% | 24.9% | 29.0% |
| ≥2% (the claim) | 18.2% | 17.8% | 17.4% | 20.7% |
| ≥3% | 8.7% | 9.1% | 10.4% | 12.4% |
The claim as stated — 2% after the station or the midpoint — sits below the base rate in both columns. And the average five-day return after a station is +0.02%, against an unconditional +0.18% — flat, not falling. After the midpoint it is +0.35%: better than an average week.
Maybe closes are too forgiving — the folklore version often means “it wicked down 2%.” So here is the same grid measured to the lowest intraday low instead of the lowest close. The base rates jump (a 2% wick follows more than a quarter of all trading days), and the stations still can't beat them:
| Wick within 5 days | Any-day base rate | After station retro | After midpoint | After station direct |
|---|---|---|---|---|
| ≥1% | 50.2% | 49.2% | 46.5% | 50.6% |
| ≥1.5% | 36.5% | 33.9% | 34.0% | 38.2% |
| ≥2% (the claim) | 26.6% | 26.0% | 28.2% | 27.8% |
| ≥3% | 13.6% | 11.6% | 15.8% | 16.6% |
More than half of all trading days wick 1% lower within five days, and over a quarter wick 2% lower — the looser the definition, the more “confirmations” everyone gets, Mercury or not. The stations sit at or below every wick base rate; the midpoint's 28.2% vs. 26.6% is well inside noise (p = 0.31).
One cell flirts with significance: 3% closing drops after the station direct (12.4% vs. 8.7%, p = 0.03 uncorrected). But that is the best-looking of twenty-four cells we scanned; that many looks demand p < 0.002, and it isn't close. It is also the opposite corner from the claim — the moment Mercury resumes normal service.
Check Every Station and Midpoint Yourself
Don't take the aggregates on faith. Below is every Mercury retrograde since 1950 with the worst close-to-close move in the five trading days after its station and after its midpoint — red when it met the 2% bar, with a toggle to measure by closing lows or intraday wicks. Click any date to open the chart and see the week for yourself. You will find Black Monday in October 1987. You will also find dozens of stations the market shrugged straight past.
242
Stations 1950–2026
43 (17.8%)
With a 2% drop in the next 5 days
18.2%
Random-day base rate
Each cell shows the worst move over the 5 trading days after the event, versus the event day's close — measured to the lowest close or to the lowest intraday wick, whichever is selected (red = fell 2% or more). Click a date to open the S&P 500 chart around it and see the move for yourself.
| Station retrograde | Next 5 days | Midpoint | Next 5 days |
|---|---|---|---|
| Jun 29, 2026 | +0.6% | Jul 11, 2026 | not enough data yet |
| Feb 26, 2026 | -1.3% | Mar 9, 2026 | -2.4% |
| Nov 9, 2025 | -2.3% | Nov 19, 2025 | -1.6% |
| Jul 18, 2025 | +0.1% | Jul 30, 2025 | -2.0% |
| Mar 15, 2025 | -0.4% | Mar 26, 2025 | -2.3% |
| Nov 26, 2024 | -0.4% | Dec 5, 2024 | -0.7% |
| Aug 5, 2024 | +0.3% | Aug 16, 2024 | +0.3% |
| Apr 1, 2024 | -1.8% | Apr 13, 2024 | -3.0% |
| Dec 13, 2023 | -0.2% | Dec 23, 2023 | -0.3% |
| Aug 23, 2023 | -1.4% | Sep 3, 2023 | -1.4% |
| Apr 21, 2023 | -1.9% | May 3, 2023 | -0.7% |
| Dec 29, 2022 | -1.1% | Jan 8, 2023 | +0.7% |
| Sep 10, 2022 | -4.8% | Sep 21, 2022 | -3.8% |
| May 10, 2022 | -1.8% | May 22, 2022 | -0.8% |
| Jan 14, 2022 | -5.7% | Jan 24, 2022 | -1.9% |
| Sep 27, 2021 | -3.2% | Oct 7, 2021 | -1.1% |
| May 29, 2021 | -0.3% | Jun 10, 2021 | -0.4% |
| Jan 30, 2021 | +1.6% | Feb 9, 2021 | -0.0% |
| Oct 13, 2020 | -2.4% | Oct 23, 2020 | -5.6% |
| Jun 18, 2020 | -2.1% | Jun 30, 2020 | +0.5% |
| Feb 16, 2020 | -4.6% | Feb 27, 2020 | -0.8% |
| Oct 31, 2019 | +1.0% | Nov 10, 2019 | +0.2% |
| Jul 7, 2019 | +0.1% | Jul 19, 2019 | +0.3% |
| Mar 5, 2019 | -1.7% | Mar 16, 2019 | -0.8% |
| Nov 16, 2018 | -3.8% | Nov 26, 2018 | +0.3% |
| Jul 26, 2018 | -1.2% | Aug 7, 2018 | -1.3% |
| Mar 22, 2018 | -2.1% | Apr 3, 2018 | -0.4% |
| Dec 3, 2017 | -0.4% | Dec 12, 2017 | -0.5% |
| Aug 12, 2017 | -0.7% | Aug 24, 2017 | +0.2% |
| Apr 9, 2017 | -1.2% | Apr 21, 2017 | +1.1% |
| Dec 19, 2016 | -0.1% | Dec 29, 2016 | -0.5% |
| Aug 30, 2016 | -0.2% | Sep 10, 2016 | -0.1% |
| Apr 28, 2016 | -1.2% | May 10, 2016 | -1.8% |
| Jan 5, 2016 | -4.7% | Jan 15, 2016 | -1.1% |
| Sep 17, 2015 | -2.9% | Sep 28, 2015 | +0.1% |
| May 19, 2015 | -1.1% | May 30, 2015 | -0.7% |
| Jan 21, 2015 | -1.5% | Jan 31, 2015 | +1.3% |
| Oct 4, 2014 | -3.1% | Oct 14, 2014 | -0.8% |
| Jun 7, 2014 | -1.0% | Jun 19, 2014 | -0.5% |
| Feb 6, 2014 | +1.3% | Feb 17, 2014 | -0.7% |
| Oct 21, 2013 | +0.1% | Oct 31, 2013 | -0.5% |
| Jun 26, 2013 | +0.2% | Jul 8, 2013 | +0.7% |
| Feb 23, 2013 | -1.8% | Mar 6, 2013 | +0.2% |
| Nov 6, 2012 | -3.8% | Nov 16, 2012 | +2.0% |
| Jul 15, 2012 | -0.2% | Jul 27, 2012 | -1.5% |
| Mar 12, 2012 | +1.7% | Mar 23, 2012 | +0.4% |
| Nov 24, 2011 | -0.3% | Dec 3, 2011 | -0.8% |
| Aug 3, 2011 | -11.2% | Aug 14, 2011 | -6.7% |
| Mar 30, 2011 | -0.2% | Apr 11, 2011 | -1.5% |
| Dec 10, 2010 | -0.4% | Dec 20, 2010 | +0.6% |
| Aug 20, 2010 | -2.3% | Aug 31, 2010 | +3.0% |
| Apr 18, 2010 | +0.7% | Apr 29, 2010 | -6.5% |
| Dec 26, 2009 | -1.0% | Jan 5, 2010 | -0.0% |
| Sep 7, 2009 | +0.8% | Sep 18, 2009 | -2.2% |
| May 7, 2009 | -2.6% | May 18, 2009 | -2.5% |
| Jan 11, 2009 | -7.5% | Jan 21, 2009 | -1.5% |
| Sep 24, 2008 | -6.7% | Oct 4, 2008 | -18.2% |
| May 26, 2008 | -0.6% | Jun 7, 2008 | -1.9% |
| Jan 28, 2008 | +0.1% | Feb 8, 2008 | +0.6% |
| Oct 12, 2007 | -3.9% | Oct 22, 2007 | +0.5% |
| Jun 15, 2007 | -2.0% | Jun 27, 2007 | -0.2% |
| Feb 14, 2007 | +0.0% | Feb 25, 2007 | -5.2% |
| Oct 28, 2006 | -0.9% | Nov 7, 2006 | -0.3% |
| Jul 4, 2006 | -1.1% | Jul 16, 2006 | +0.2% |
| Mar 2, 2006 | -1.3% | Mar 13, 2006 | +1.0% |
| Nov 14, 2005 | -0.4% | Nov 23, 2005 | -1.3% |
| Jul 23, 2005 | -0.4% | Aug 4, 2005 | -1.0% |
| Mar 19, 2005 | -1.5% | Mar 31, 2005 | -0.7% |
| Nov 30, 2004 | +0.3% | Dec 10, 2004 | +0.5% |
| Aug 9, 2004 | -0.2% | Aug 21, 2004 | -0.2% |
| Apr 6, 2004 | -1.7% | Apr 18, 2004 | -1.6% |
| Dec 17, 2003 | +1.1% | Dec 27, 2003 | +1.1% |
| Aug 28, 2003 | +0.5% | Sep 8, 2003 | -2.0% |
| Apr 26, 2003 | +1.8% | May 8, 2003 | +1.4% |
| Jan 2, 2003 | -0.1% | Jan 12, 2003 | -4.2% |
| Sep 14, 2002 | -5.2% | Sep 25, 2002 | -2.9% |
| May 15, 2002 | -1.0% | May 27, 2002 | -3.1% |
| Jan 18, 2002 | -0.7% | Jan 28, 2002 | -3.4% |
| Oct 1, 2001 | +1.2% | Oct 11, 2001 | -2.6% |
| Jun 4, 2001 | -1.0% | Jun 16, 2001 | -0.5% |
| Feb 3, 2001 | -2.6% | Feb 14, 2001 | -4.8% |
| Oct 18, 2000 | +1.7% | Oct 28, 2000 | +1.4% |
| Jun 23, 2000 | +0.1% | Jul 5, 2000 | +0.7% |
| Feb 21, 2000 | -1.4% | Mar 3, 2000 | -3.8% |
| Nov 5, 1999 | -0.4% | Nov 15, 1999 | +1.2% |
| Jul 12, 1999 | -0.4% | Jul 24, 1999 | -2.1% |
| Mar 10, 1999 | +0.6% | Mar 21, 1999 | -2.7% |
| Nov 21, 1998 | +0.0% | Dec 1, 1998 | -2.1% |
| Jul 31, 1998 | -4.3% | Aug 11, 1998 | -0.6% |
| Mar 27, 1998 | -0.2% | Apr 8, 1998 | +0.6% |
| Dec 7, 1997 | -3.0% | Dec 17, 1997 | -3.4% |
| Aug 17, 1997 | +0.8% | Aug 29, 1997 | +3.1% |
| Apr 14, 1997 | +1.5% | Apr 26, 1997 | +1.0% |
| Dec 23, 1996 | -0.8% | Jan 2, 1997 | +1.4% |
| Sep 4, 1996 | -0.9% | Sep 15, 1996 | -0.4% |
| May 3, 1996 | -0.5% | May 15, 1996 | -0.1% |
| Jan 9, 1996 | -1.8% | Jan 19, 1996 | +0.2% |
| Sep 22, 1995 | -0.1% | Oct 2, 1995 | -0.6% |
| May 24, 1995 | -0.9% | Jun 5, 1995 | -1.4% |
| Jan 25, 1995 | +0.2% | Feb 5, 1995 | -0.2% |
| Oct 9, 1994 | +1.4% | Oct 19, 1994 | -2.0% |
| Jun 12, 1994 | -0.8% | Jun 24, 1994 | +0.3% |
| Feb 11, 1994 | -0.5% | Feb 22, 1994 | -1.5% |
| Oct 25, 1993 | +0.0% | Nov 4, 1993 | +0.5% |
| Jul 1, 1993 | -1.7% | Jul 13, 1993 | -0.5% |
| Feb 27, 1993 | -0.3% | Mar 10, 1993 | -1.8% |
| Nov 11, 1992 | -0.7% | Nov 21, 1992 | -0.4% |
| Jul 19, 1992 | -0.7% | Jul 31, 1992 | -1.3% |
| Mar 16, 1992 | +0.7% | Mar 28, 1992 | -0.7% |
| Nov 28, 1991 | -0.3% | Dec 8, 1991 | -0.1% |
| Aug 7, 1991 | -0.9% | Aug 19, 1991 | +0.8% |
| Apr 4, 1991 | -1.7% | Apr 16, 1991 | -1.7% |
| Dec 14, 1990 | -0.2% | Dec 24, 1990 | -1.1% |
| Aug 25, 1990 | +2.3% | Sep 5, 1990 | -1.2% |
| Apr 23, 1990 | -0.6% | May 5, 1990 | +0.6% |
| Dec 30, 1989 | -0.3% | Jan 9, 1990 | -3.6% |
| Sep 11, 1989 | -1.3% | Sep 22, 1989 | -0.8% |
| May 12, 1989 | +0.5% | May 24, 1989 | -0.0% |
| Jan 15, 1989 | -0.2% | Jan 25, 1989 | +0.9% |
| Sep 28, 1988 | +0.6% | Oct 9, 1988 | -1.5% |
| May 31, 1988 | +1.1% | Jun 12, 1988 | -0.9% |
| Feb 2, 1988 | -2.5% | Feb 12, 1988 | +0.1% |
| Oct 16, 1987 | -20.5% | Oct 26, 1987 | +2.4% |
| Jun 21, 1987 | -0.9% | Jul 3, 1987 | -0.2% |
| Feb 18, 1987 | -1.1% | Mar 1, 1987 | +0.4% |
| Nov 2, 1986 | -0.0% | Nov 12, 1986 | -4.0% |
| Jul 9, 1986 | -3.8% | Jul 21, 1986 | -0.1% |
| Mar 7, 1986 | +0.5% | Mar 18, 1986 | -1.0% |
| Nov 18, 1985 | -0.0% | Nov 28, 1985 | -1.0% |
| Jul 27, 1985 | -1.5% | Aug 8, 1985 | -0.9% |
| Mar 24, 1985 | +0.3% | Apr 5, 1985 | -0.6% |
| Dec 4, 1984 | -0.8% | Dec 14, 1984 | +0.6% |
| Aug 14, 1984 | -1.0% | Aug 26, 1984 | -0.9% |
| Apr 11, 1984 | +1.5% | Apr 23, 1984 | +0.8% |
| Dec 21, 1983 | -0.2% | Dec 31, 1983 | -0.5% |
| Sep 2, 1983 | +0.3% | Sep 13, 1983 | -0.3% |
| May 1, 1983 | +0.1% | May 13, 1983 | -1.8% |
| Jan 7, 1983 | +0.4% | Jan 17, 1983 | -4.6% |
| Sep 19, 1982 | +0.7% | Sep 30, 1982 | +0.9% |
| May 21, 1982 | -2.6% | Jun 1, 1982 | -1.8% |
| Jan 23, 1982 | -0.2% | Feb 2, 1982 | -3.7% |
| Oct 6, 1981 | +1.2% | Oct 16, 1981 | -0.5% |
| Jun 9, 1981 | +0.1% | Jun 21, 1981 | -0.1% |
| Feb 8, 1981 | -1.8% | Feb 19, 1981 | -0.0% |
| Oct 23, 1980 | -2.5% | Nov 2, 1980 | -0.1% |
| Jun 28, 1980 | -1.5% | Jul 10, 1980 | +0.8% |
| Feb 25, 1980 | -0.9% | Mar 7, 1980 | -1.4% |
| Nov 9, 1979 | +1.4% | Nov 19, 1979 | -0.5% |
| Jul 17, 1979 | -0.2% | Jul 29, 1979 | +0.6% |
| Mar 14, 1979 | +0.1% | Mar 26, 1979 | -0.1% |
| Nov 25, 1978 | -2.1% | Dec 5, 1978 | -0.9% |
| Aug 4, 1978 | -0.4% | Aug 16, 1978 | -0.7% |
| Apr 1, 1978 | -0.8% | Apr 13, 1978 | +2.1% |
| Dec 11, 1977 | -1.0% | Dec 21, 1977 | +0.8% |
| Aug 22, 1977 | -1.8% | Sep 2, 1977 | -1.5% |
| Apr 19, 1977 | -3.0% | May 1, 1977 | +0.3% |
| Dec 28, 1976 | -1.0% | Jan 7, 1977 | -1.5% |
| Sep 8, 1976 | -0.9% | Sep 19, 1976 | +0.5% |
| May 9, 1976 | -1.9% | May 20, 1976 | -2.6% |
| Jan 14, 1976 | -0.5% | Jan 24, 1976 | -0.7% |
| Sep 26, 1975 | -3.8% | Oct 7, 1975 | +1.4% |
| May 29, 1975 | +1.6% | Jun 10, 1975 | -0.4% |
| Jan 30, 1975 | +1.0% | Feb 9, 1975 | +0.3% |
| Oct 13, 1974 | -3.3% | Oct 23, 1974 | -1.3% |
| Jun 17, 1974 | -2.9% | Jun 29, 1974 | -5.7% |
| Feb 15, 1974 | -0.2% | Feb 26, 1974 | -0.5% |
| Oct 30, 1973 | -4.0% | Nov 9, 1973 | -2.7% |
| Jul 6, 1973 | +0.8% | Jul 18, 1973 | +0.2% |
| Mar 4, 1973 | +1.0% | Mar 15, 1973 | -4.6% |
| Nov 15, 1972 | +0.6% | Nov 25, 1972 | -0.7% |
| Jul 24, 1972 | -0.6% | Aug 5, 1972 | +0.2% |
| Mar 21, 1972 | +0.1% | Apr 2, 1972 | +0.6% |
| Dec 2, 1971 | +0.7% | Dec 12, 1971 | -0.3% |
| Aug 12, 1971 | -0.3% | Aug 24, 1971 | -1.4% |
| Apr 9, 1971 | +0.8% | Apr 21, 1971 | +0.2% |
| Dec 19, 1970 | -0.3% | Dec 29, 1970 | -1.0% |
| Aug 30, 1970 | -0.7% | Sep 10, 1970 | -1.1% |
| Apr 28, 1970 | -2.1% | May 10, 1970 | -4.0% |
| Jan 4, 1970 | -1.9% | Jan 14, 1970 | -2.2% |
| Sep 16, 1969 | -0.2% | Sep 27, 1969 | -1.7% |
| May 17, 1969 | -1.8% | May 29, 1969 | -1.3% |
| Jan 20, 1969 | -0.1% | Jan 30, 1969 | +0.3% |
| Oct 3, 1968 | -0.0% | Oct 13, 1968 | +0.2% |
| Jun 6, 1968 | +0.5% | Jun 18, 1968 | -0.0% |
| Feb 6, 1968 | -3.1% | Feb 17, 1968 | +0.2% |
| Oct 21, 1967 | -1.0% | Oct 31, 1967 | -2.3% |
| Jun 26, 1967 | -1.1% | Jul 8, 1967 | +0.4% |
| Feb 23, 1967 | -1.1% | Mar 6, 1967 | +0.1% |
| Nov 6, 1966 | +0.8% | Nov 16, 1966 | -3.3% |
| Jul 14, 1966 | -1.5% | Jul 26, 1966 | -1.7% |
| Mar 11, 1966 | -1.7% | Mar 23, 1966 | -0.4% |
| Nov 22, 1965 | -0.0% | Dec 2, 1965 | -0.7% |
| Aug 1, 1965 | +0.1% | Aug 13, 1965 | -0.1% |
| Mar 29, 1965 | +0.1% | Apr 10, 1965 | +0.4% |
| Dec 9, 1964 | -0.3% | Dec 18, 1964 | -0.3% |
| Aug 19, 1964 | -1.2% | Aug 30, 1964 | +0.4% |
| Apr 16, 1964 | +0.2% | Apr 28, 1964 | -0.6% |
| Dec 26, 1963 | +0.2% | Jan 5, 1964 | +0.0% |
| Sep 6, 1963 | -0.4% | Sep 17, 1963 | -0.4% |
| May 6, 1963 | -0.1% | May 18, 1963 | -0.5% |
| Jan 11, 1963 | -0.3% | Jan 21, 1963 | +0.3% |
| Sep 24, 1962 | -2.0% | Oct 4, 1962 | +0.6% |
| May 26, 1962 | -6.7% | Jun 7, 1962 | -7.0% |
| Jan 27, 1962 | -0.3% | Feb 6, 1962 | +0.7% |
| Oct 10, 1961 | -0.4% | Oct 20, 1961 | -0.0% |
| Jun 14, 1961 | -2.1% | Jun 26, 1961 | 0.0% |
| Feb 12, 1961 | +0.4% | Feb 23, 1961 | +0.4% |
| Oct 27, 1960 | -0.4% | Nov 6, 1960 | +0.4% |
| Jul 3, 1960 | -0.3% | Jul 15, 1960 | -2.4% |
| Mar 1, 1960 | -4.5% | Mar 12, 1960 | +0.1% |
| Nov 13, 1959 | -1.1% | Nov 23, 1959 | +0.5% |
| Jul 22, 1959 | +0.1% | Aug 3, 1959 | -3.4% |
| Mar 19, 1959 | -1.0% | Mar 30, 1959 | -0.0% |
| Nov 30, 1958 | -0.4% | Dec 9, 1958 | +0.8% |
| Aug 9, 1958 | -1.1% | Aug 21, 1958 | +0.1% |
| Apr 6, 1958 | +0.2% | Apr 18, 1958 | +0.2% |
| Dec 16, 1957 | -1.8% | Dec 26, 1957 | -0.8% |
| Aug 27, 1957 | -0.3% | Sep 7, 1957 | -1.8% |
| Apr 25, 1957 | -0.1% | May 6, 1957 | -0.3% |
| Jan 1, 1957 | -1.0% | Jan 11, 1957 | -3.3% |
| Sep 13, 1956 | +0.3% | Sep 24, 1956 | -3.7% |
| May 14, 1956 | -1.9% | May 26, 1956 | -1.2% |
| Jan 18, 1956 | -2.4% | Jan 28, 1956 | +0.3% |
| Oct 1, 1955 | -3.0% | Oct 11, 1955 | +1.0% |
| Jun 3, 1955 | +1.7% | Jun 15, 1955 | +0.2% |
| Feb 3, 1955 | +0.1% | Feb 14, 1955 | -0.3% |
| Oct 18, 1954 | +0.3% | Oct 28, 1954 | -0.6% |
| Jun 23, 1954 | +0.2% | Jul 5, 1954 | +0.1% |
| Feb 20, 1954 | -0.3% | Mar 3, 1954 | +0.3% |
| Nov 3, 1953 | -1.2% | Nov 13, 1953 | -1.2% |
| Jul 11, 1953 | -1.4% | Jul 23, 1953 | -0.7% |
| Mar 9, 1953 | +0.3% | Mar 20, 1953 | -0.9% |
| Nov 20, 1952 | -0.0% | Nov 29, 1952 | -0.2% |
| Jul 29, 1952 | +0.4% | Aug 10, 1952 | -2.3% |
| Mar 26, 1952 | +0.9% | Apr 6, 1952 | -0.6% |
| Dec 7, 1951 | -0.3% | Dec 17, 1951 | +0.3% |
| Aug 17, 1951 | -0.8% | Aug 28, 1951 | +0.8% |
| Apr 14, 1951 | -0.2% | Apr 26, 1951 | +1.0% |
| Dec 23, 1950 | -0.8% | Jan 2, 1951 | -0.4% |
| Sep 3, 1950 | -0.1% | Sep 14, 1950 | +0.2% |
| May 3, 1950 | -0.8% | May 15, 1950 | +1.0% |
| Jan 8, 1950 | -2.4% | Jan 18, 1950 | -0.7% |
Why the Claim Feels So True
1. The base rate is a fifth, and nobody mentions it
A 2% five-day drop follows 18.2% of all trading days. Almost one in five “predictions” comes true with no astronomy at all — and with three stations a year, that is one or two visible confirmations every year, forever.
2. Black Monday really did follow a station
Mercury stationed retrograde on Friday, October 16, 1987; the next trading day the S&P 500 fell 20.5% within the week. Add the COVID station (February 16, 2020) and the January 2022 top (station January 14, 2022), and the claim has three of the most memorable weeks in market history on its highlight reel. 239 other stations quietly did nothing special.
3. The last decade was crash-rich
Ten of the 34 stations since 2016 (29.4%) preceded a 2% drop — above the base rate, though not significantly (p = 0.08). The hits cluster in 2016–2022: two 2018 corrections, three 2020 events, the 2022 bear. In an era that crashed a lot, every thrice-a-year rule looked prophetic. The full 76-year record is where that illusion goes to die.
4. “About 2%” is a stretchy target
A 1.8% dip, a 2% intraday wick, a drop that starts six days later — in the retelling, all of them count. We tested the stretchy versions too (1–3% thresholds, intraday lows): the grid above is what honest counting looks like, and nothing in it survives.
Frequently Asked Questions
Does the S&P 500 drop 2% after Mercury goes retrograde?
No more often than after any other day: 17.8% of the 242 stations since 1950 were followed by a 2% close-to-close drop within five trading days, against an 18.2% any-day base rate. The midpoints scored 17.4% on the same test.
Didn't Mercury station retrograde right before Black Monday 1987?
Yes — Friday, October 16, 1987, one trading day before the crash. It is the most dramatic hit in the dataset, and it is one station out of 242. A sample of one, retold for forty years, is the engine of this claim.
Why did it seem to work so well since 2016?
Ten of 34 recent stations preceded 2% drops (29.4% vs. the 18.2% base rate, p = 0.08) — a lean built almost entirely on the crash-rich 2016–2022 stretch. When drops are everywhere, every date rule catches some.
What happened after the current station, June 29, 2026?
The S&P 500 never closed below the station-day close in the following five sessions and finished them up 0.85%. The July 11–12 midpoint's five-day window is still completing as this article goes out — the table above will show it as soon as the data is in.
How were the retrograde dates computed?
Daily geocentric Mercury longitudes from a Swiss Ephemeris, 1950–2026, with retrograde motion detected from the day-over-day longitude delta (wrap-aware at the 0°/360° boundary) — the same dataset as our retrograde-midpoint reversal study.
This is the second claim about these dates we've put through the grinder — the first, whether the market reverses at the retrograde midpoint, failed the same way: real astronomy, honest anecdotes, and a base rate nobody ran.
Patterns That Survive the Base-Rate Test
Seasonal Edge backtests every calendar and cycle pattern against decades of data — win rates, profit factors, and regime filters included — so you can see which recurring dates actually held up historically and which are folklore.
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