Midpoints

The exact middle degree between two planets’ longitudes, written as A/B (for example Sun/Moon). It is read as the sensitive point where the two planets’ energies blend.

The Ebertin method folds conjunction, square and opposition onto one axis; the 90° dial aligns that hard-aspect family so contacts become easy to read.

Midpoints contacting a natal planet or angle (ASC/MC) within a tight orb come first; the Sun/Moon and ASC/MC midpoints traditionally carry the most weight.

The result has two parts. Midpoint Trees list the midpoints falling on each body, tightest orb first; the tightest contacts are considered the strongest. The Sorted Index orders every pair by its 90° (or 45°) dial position, so consecutive rows sit next to each other on the dial.

Uranian astrology is the method Alfred Witte developed in Hamburg in the early 20th century; it is also known as the Hamburg School. It is built on midpoints, planetary pictures (symmetrical arrangements of points, e.g. Sun = Venus/Mars) and the dial, and adds eight hypothetical (trans-Neptunian) points proposed by Witte and Friedrich Sieggrün to the planets from the Sun to Pluto. Reinhold Ebertin’s cosmobiology takes over the midpoint and 90° dial techniques from this school but does not use the hypothetical points. This directory works with the 10 planets, the Node, Chiron, ASC and MC; to see the hypothetical points, tick “Uranian / Trans-Neptunians” on the birth chart form and they appear on the chart and the dial (the box also draws Transpluto, which is not a Hamburg School point).

On the 90° dial the zodiac is folded into four overlapping 90° segments, so conjunctions, squares and oppositions fall on the same spot. Drag the ring to bring the pointer onto a planet and the midpoints falling on that planet are listed in the centre of the dial. A pair sitting at equal distances on either side of the pointer has its midpoint on the pointer’s axis: either at the tip (conjunct, square or opposite the planet) or at the far end (semisquare or sesquiquadrate). On the 45° dial the semisquare and sesquiquadrate also fall on the same spot as the conjunction. Open it on the birth chart and live sky pages with the “90° Dial” and “45° Dial” buttons.