Moon phase and the stock market
Moon new, last good reading 9 Nov 2026. Moon, New York sky, sunspots. Moon phase and the stock market and the other weird recession indicators are on one page, each with its latest reading.
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Moon: worked out on our server with the method in Jean Meeus, Astronomical Algorithms, chapter 49. New and full moon times are good to a few minutes.
Sky: the latest National Weather Service observation from Central Park, New York (station KNYC). Sunspots: the monthly sunspot number from the NOAA Space Weather Prediction Center.
People have studied all three. William Stanley Jevons linked trade cycles to the sunspot cycle in 1875. Hirshleifer and Shumway (2003, "Good Day Sunshine") looked at morning sunshine and stock returns in 26 cities. Yuan, Zheng and Zhu (2006, "Are investors moonstruck?") looked at lunar phases and returns. Shown for fun, with no claim either way.
Source: NWS, NOAA SWPC. Last good reading 9 Nov 2026.