For births in Germany, Austria and Switzerland, Leo, Virgo, Libra and Scorpio share the lead with 11.7 % of charts each. The rarest are Aries and Pisces at 3.8 %. The reason: at our latitude the zodiac sits at a slant to the horizon, so some signs cross it slowly and steeply, others quickly and flat.
On average every house is 30°, one twelfth of the zodiac. But here the 1st house measures between 15° and 65°, in eight charts out of ten between 17° and 53°. At the equator it only ranges from 28° to 33°. When a house grows larger than a sign, it can swallow a whole sign that then has no cusp of its own (an intercepted sign): for the 1st house in 17.3 % of charts.
Computed with the Swiss Ephemeris and Placidus houses, as in our calculator: 248,215 birth moments from 1950 to 2009, spread evenly over every hour and every day of the year, for Zurich, Munich, Vienna, Frankfurt, Cologne, Berlin and Hamburg. Comparison values for the equator to 60° north from the same birth moments. Every hour counts equally, so the numbers show what the sky allows, not when babies actually arrive.