Square of Nine levels. Bradley siderograph turning dates. Planetary aspects, dominant cycles and 100 years of historical analogs. Upload your price data and get the numbers in seconds, without a $2,000 desktop licence.
What is Crohamhurst? It is a calculation engine for traders who use W.D. Gann and planetary cycle methods. You bring the price data, Crohamhurst does the maths: harmonic price levels, aspect dates, cycle periods and past dates when the sky looked like it does today. It does not give trade signals and it does not predict anything for you. It replaces the ephemeris books, spreadsheets and expensive desktop software the method normally requires.
Computation modules
Five analytical tools, each built on the astronomical and geometric principles W.D. Gann documented in his trading courses and books.
Enter any swing high or low and get the harmonic support and resistance levels above and below it, on the cardinal and diagonal axes, colour coded. No more spiral charts by hand.
Donald Bradley's 1948 planetary aspect index, computed for any date range and plotted against your price data. Turning points in the curve are candidate dates for trend changes.
Geocentric and heliocentric positions for all major planets and the Moon, with aspect detection and zodiac notation for any date range from 1900 to 2050. JPL DE421 precision.
FFT based detection of the dominant repeating cycles in your price series, with the Hurst exponent to tell you whether the market is trending, random or mean reverting.
Scans up to 100 years of astronomical history for the dates when the planetary configuration most closely matched today's sky, so you can study what markets did at those times.
Time and price squaring via the 24 hour wheel. Identify time price symmetry points and natural turning dates directly from your chart data.
Workflow
No API keys, no Bloomberg terminal, no desktop dongle. Your browser is the interface.
Paste prices directly, enter a date range, or upload a CSV from any data source. Crohamhurst accepts standard OHLCV and close only formats.
Square of Nine, Bradley, Ephemeris, Cycle Scanner or Historical Analogs. Each module has built in documentation explaining the methodology.
Results render in seconds. Levels, charts, analog tables and cycle periods are displayed with contextual explanations built into every output.
Why Crohamhurst
Traditional Gann and financial astrology software is desktop only, Windows only, and priced like a terminal. Crohamhurst covers the core calculations in your browser.
| Typical desktop suite | Crohamhurst | |
|---|---|---|
| Price | $1,500 to $5,000 up front | Free to $49/mo, or $499 once |
| Platform | Windows install, licence dongle | Any browser, any device |
| Ephemeris | Bundled, version locked | Skyfield + JPL DE421, sub arcsecond |
| Your data | Proprietary formats | Plain CSV in, results in seconds |
| Updates | Paid upgrades | Continuous, included |
Comparing published list prices of established desktop astro trading suites. Crohamhurst does not yet replicate every charting feature of a full desktop suite; it focuses on the calculations.
Pricing
Every plan includes all five modules. Paid plans add higher compute quotas and priority processing.
Annual billing saves about 17%. Australian GST included. Cancel anytime. Full pricing details →
Crohamhurst Observatory is where Inigo Jones spent decades forecasting Australian weather from planetary cycles. The platform carries his empirical spirit into market analysis. Read the story.