Quick summary

Some academic studies find a modest pattern — returns historically tended to be lower around full moons and higher around new moons — but the finding is debated and may be fragile after costs and more stringent testing.

What the research shows

• Several papers (large cross-country samples and long U.S. histories) document statistically significant new-moon vs full-moon return differences over historical samples.
• The reported magnitude in broad portfolio tests is small but non-negligible (paper estimates of a few percent a year on aggregate historical samples).

Why would the moon matter?

The main hypothesis is behavioral: tiny, predictable mood shifts linked to lunar phase alter risk appetite or valuation judgments — and when millions of investors move a little in the same direction, prices can reflect that. But the mood → price link is speculative and hard to prove causally.

Caveats & academic pushback

Other researchers find the lunar signal weak or absent once you control for data-mining, overlapping windows and alternate cycles. Meta-reviews of lunar effects on human behaviour also warn that many positive findings in the literature are false positives. In short: results are mixed and can be sensitive to methodology.

Practical trading notes

1. Effect sizes reported are historically small — transaction costs and slippage may remove any actionable edge.
2. Beware of data-snooping: many calendar/seasonality rules look significant in-sample but fail out-of-sample.
3. If you track lunar signals, use them as a complementary filter (sentiment/mood lens) rather than the primary trade trigger.

For traders looking to navigate this volatile phase can make use of tips whose link are given below:

👉 Nifty Tip | BankNifty Tip

Investor takeaway

The lunar cycle is an intriguing historical pattern but not a proven market mover. Use lunar signals only as a minor sentiment filter, backtest any rule carefully on out-of-sample data, and never rely on celestial timing alone for position sizing or risk management.

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Lunar phases, Market psychology, Seasonality, Trading strategy, Nifty, BankNifty

SEBI Disclaimer: The information provided in this post is for informational purposes only and should not be construed as investment advice. Readers must perform their own due diligence and consult a registered investment advisor before making any investment decisions. The views expressed are general in nature and may not suit individual investment objectives or financial situations.