Astrology Research & Data
Venusward Research · Updated September 13, 2026
Venusward runs its own Swiss Ephemeris calculation engine on thousands of simulated birth charts to answer questions most astrology sites only guess at: how common an empty house really is, how often house systems disagree, and how sensitive a rising sign is to birth-time error. Every number here links back to its method, sample, and script.
Key Numbers
| Study | Headline number | Sample |
|---|---|---|
| Empty House Probability | 49.02% of charts have an empty 7th house | 20,000 simulated charts |
| Placidus vs. Whole Sign Disagreement | 25.61% of charts flip empty-or-not between systems | 20,000 simulated charts |
| Birth Time Sensitivity | Median 30 minutes changes the rising sign | 2,000 simulated charts |
Method
All three studies use Venusward's own production calculation code (the Swiss Ephemeris library, file-free Moshier mode) run against simulated samples, not real user data — none of it comes from the free calculator or the paid report. Each study page documents its own sample size, sampling method, and the exact script that produced it, so the numbers can be reproduced independently rather than taken on faith.
Limits
These are simulations over synthetic samples, not measurements of real births or predictions for an individual chart. Each study page states its own sampling limits (geographic coverage, birth year range, and sample size) in detail — read the individual page before quoting a number out of context.
How to Cite
Venusward. "Astrology Research & Data" (2026). https://venusward.com/research
To cite an individual study, use the "How to Cite" section on that study's own page instead.