The "lunar market calendar" presents historical statistics computed from a fixed, dated snapshot of S&P 500 daily closing prices. Historical averages do not predict future returns. The "lunar effect" in stock returns is a well-known example of a statistical pattern that is contested in the academic literature and has not been shown to persist out of sample. Nothing on this site is a recommendation to buy, sell, or hold any security. Trading involves risk of loss. Consult a licensed financial professional before making investment decisions.
Sun times, golden hour, and moon phases are computed with standard published algorithms (NOAA solar equations; mean-synodic moon phase). Moon-phase values carry approximately ±1 day accuracy at phase-bucket edges. Times may differ from observatory-published values by a few minutes. Do not rely on this site for navigation, aviation, marine, religious observance, or safety-critical purposes.
SkyRhythms is not affiliated with, endorsed by, or sponsored by NOAA, NASA, S&P Dow Jones Indices, or any other organization. "S&P 500" is referenced as the data source of the historical snapshot only.
Data snapshot: S&P 500 daily closes 2022-01-03 through 2025-12-31. Last verified: 2026-09-19.