How to Combine Astrology with Fundamental Analysis (and What Happens When You Do)

The question arrives in the same form almost every time: surely astrology is not meant to be used alone, so what if it is one input among several? It is a reasonable question and it deserves a measured answer rather than a rhetorical one. We built the model. Here is what happened.

The proposal we tested

The version put to us was a weighted composite: astrology 20 percent, technical analysis 30 percent, fundamentals 20 percent, sentiment 15 percent, open interest 10 percent. That is a common shape, and it sounds sensible. Each input contributes, no single factor carries the decision, and the result is presumably more robust than any part.

We implemented the half we have clean daily data for, which is astrology and technicals, and ran it through the identical pipeline used for everything else in our engine.

What we built

• Twelve to fourteen astrological indicators per asset: lunar phase, Bradley-style aspect index, retrograde load, natal nakshatra-lord tone, tithi class, benefic Moon aspects, eclipse-season nodal proximity, dasha-of-asset, ruler transit on commodities, the Jupiter-Saturn cycle, exact eclipse-degree proximity, eclipse window, nodal ingress, and bullion muhurat demand.
• Five technical indicators: price versus the 200-day EMA, the 20/50 EMA crossover, RSI(14) at the 60/40 thresholds, MACD(12,26,9), and 12-1 momentum.
• Four composites: astrology-only equal weight, technicals-only equal weight, both combined, and the 20/30 article weighting above.
• Two holding periods, one day and twenty days, with 5 basis points of transaction cost per unit of turnover.
• Nine assets with roughly 3,000 to 3,900 trading days each.

Every strategy was scored with a deflated Sharpe ratio, a fixed out-of-sample split and a probability-of-backtest-overfitting test.

The result

Adding factors made the statistics worse. Not neutral. Worse.

Measure	Before (12 to 14 indicators)	After (42 to 46 strategies)
Best deflated Sharpe on Nifty	0.481	0.203
Probability of backtest overfitting	lower	0.27 to 0.73
Assets where anything beat chance	0 of 9	0 of 9

Two further findings, both uncomfortable for the proposal:

• The composites were worse than their best single component on seven of the nine assets. Combining did not stabilise anything.
• The equal-weight all-astrology composite was the single worst strategy in the entire Nifty family, at an annualised Sharpe of -0.64.

Why adding factors makes it worse, in plain terms

This is the part worth understanding, because it is general and it applies well beyond astrology.

When you test one strategy and it looks good, that is mild evidence. When you test forty and pick the best one, the best of forty looks good by construction, even if all forty are worthless. The more things you try, the higher the bar the winner must clear before it means anything.

The deflated Sharpe ratio charges for exactly this. It takes the raw Sharpe and discounts it by how many strategies were in the family. So going from twelve trials to forty-six does not just fail to help, it actively raises the bar that any winner has to clear.

Every factor you add is another trial, and the multiple-testing penalty grows faster than any real signal does. A framework with no such correction cannot see this happening, and will read the resulting overfit as confirmation that the combination worked.

That last sentence is the whole danger. A multi-factor model built without a multiple-testing correction will always look better than its components, because you selected the weights after seeing the data. The improvement is manufactured by the process.

The technicals did not rescue it either

Worth stating, since the usual assumption is that technicals are the serious half. In our results, technicals beat astrology on four of nine assets and lost on five. Neither family beat chance. The premise that technicals deserve the larger weight is not supported by our data any more than the astrology weighting is.

One outlier is worth naming precisely because it is the strongest thing we have ever produced and still fails: DFMGI, the Dubai index, on MACD at a one-day hold, annualised Sharpe 1.09, deflated Sharpe 0.736, PBO 0.171. That is the highest deflated Sharpe in the whole project, and it is still short of the 0.95 bar, on our shortest price history and least liquid market. We watch it. We do not believe it.

The instability problem underneath all of it

There is a second finding that makes weighted composites even harder to justify. We re-ran the Nifty family over fifteen, fourteen, thirteen, twelve and eleven year windows, changing nothing else.

• The best deflated Sharpe moved between 0.145 and 0.659.
• The overfitting probability moved between 0.11 and 0.69.
• The apparent winning strategy swapped between two completely different rules.

At the thirteen-year window one Vedic tithi rule at a twenty-day hold produced an annualised Sharpe of 0.93 with a deflated Sharpe of 0.659 and PBO of 0.114. That is the most seductive result in the whole project and would make an excellent headline. Add two more years of data and it evaporates.

If the ranking itself is unstable, then any weighting fitted to that ranking is fitted to noise. The harness is deterministic, so this is not flakiness. It is the ranking being meaningless.

What an honest combined framework would look like

Having said all that, there is a version of the question that survives, and it is not about prediction at all.

1. Fundamentals decide what you own. Cash flows, balance sheet, competitive position, valuation. This is the part with a causal mechanism.
2. Your own circumstances decide how much. Income, obligations, time horizon, and how much loss you can absorb without changing your behaviour.
3. Astrology, used honestly, describes the third thing: you. What your temperament does under pressure, where your patience runs out, whether you concentrate or scatter. That is genuinely useful and it is not a market input.

Read the Moon's role in financial decision-making for the temperament layer and savers vs risk-takers for the risk-appetite version. The distinction we would defend is that the framework is a lens on the investor, not on the instrument.

The attribution alternative

There is a more useful thing to build than a forecast, and it is what our research keeps pointing at: decompose a move instead of predicting it. For rupee silver that means separating metal, dollar, rupee and basis, since rupee silver is COMEX silver multiplied by USD/INR, which is an identity rather than a theory. For Nifty it means sector contributions.

That requires no predictive claim, it is compliant with Indian securities rules because it explains rather than recommends, and it is honest. It is on our roadmap for exactly those reasons.

Frequently asked questions

Should I combine astrology with fundamental analysis?

Not as a forecasting composite. We built and measured that model and adding factors pushed the best deflated Sharpe on Nifty down from 0.481 to 0.203, with composites beating their best single component on only two of nine assets. What does combine sensibly is fundamentals for what to own and the astrological framework as a lens on your own temperament.

Why does adding more factors make a model worse?

Because every factor is another trial, and the best of forty strategies looks good by construction even when all forty are worthless. The deflated Sharpe ratio discounts a result by the size of the trial family, so raising the trial count from twelve to forty-six raises the bar any winner must clear.

Do technicals perform better than astrology in your tests?

Marginally and inconsistently. Technicals beat astrology on four of nine assets and lost on five, and neither family beat chance on any asset. The common assumption that technicals deserve the larger weight is not supported by our data.

What is a deflated Sharpe ratio?

A Sharpe ratio adjusted downward for the number of strategies tried, the length of the data and the shape of the return distribution. It answers whether a result would still look good if you account for how many things were attempted before finding it. We treat it as a rejection test rather than a score to maximise.

Has any strategy in your engine ever beaten chance?

No. The strongest result we have produced is DFMGI on MACD at a one-day hold, with a deflated Sharpe of 0.736 against a 0.95 bar, on our shortest price history and least liquid market. Across all nine assets, both horizons and every factor family, the verdict has never moved off indistinguishable from luck.

Why publish research that undermines your own product?

Because transparency is the product. Our position is that the framework has real reflective value and no forecasting power, and a site that publishes only flattering results has told you nothing about how carefully it works. The full methodology is on our technology page.

Important disclaimer

Educational and awareness purposes only - not investment advice and not a recommendation to buy or sell any security or commodity. AstroCapitalX is not a SEBI-registered investment adviser. Markets carry risk; please consult a SEBI-registered adviser before investing.