Free 90-Degree Dial
Enter your birth details to generate a 90-degree dial with cluster detection and a guided Uranian reading surface.
What is a 90-degree dial?
The 90-degree dial is a core technique in Uranian astrology, developed by Alfred Witte and the Hamburg School in the early 20th century. It compresses the full 360-degree zodiac into a 90-degree circle by folding each position modulo 90. The result is a view where conjunctions, squares, and oppositions all appear as the same pattern: factors clustered together on the dial.
This fold makes some structures easier to see than they are on a standard chart wheel. Two planets in an exact square appear side by side on the dial. A midpoint that falls on a cardinal axis appears at 0° on the dial (representing 0° Aries, Cancer, Libra, and Capricorn simultaneously). The simplicity is the point: the 90-degree dial de-emphasizes zodiac sign context and foregrounds angular relationships.
Our calculator plots natal planets, the lunar node, the Aries Point, and Ascendant/MC when birth time is known. It detects clusters within your chosen orb and optionally includes the eight hypothetical Trans-Neptunian Points (Cupido, Hades, Zeus, Kronos, Apollon, Admetos, Vulcanus, and Poseidon). Augurine calculates those TNP factors with local Keplerian approximations calibrated against Swiss Ephemeris reference positions; they are optional Hamburg School factors, not observed physical bodies.
How to read a 90-degree dial
Start by looking for clusters: groups of factors packed tightly together on the dial. Each cluster represents planets, points, or TNPs whose folded positions sit within your selected orb. In Uranian practice, tighter clusters usually get more interpretive attention, but they still need chart context.
Rotate the dial to center a cluster at the top (0°) to inspect it. This is the traditional Uranian practice: rotating the dial so that one factor sits at the pointer and reading off which other factors align with it. Our tool lets you rotate freely with the slider.
The factor table shows both the original ecliptic longitude and the folded dial position. Use the ecliptic value when you need to know the zodiac sign and degree; use the dial position to see the 90° symmetry. For deeper analysis, use the Planetary Picture Scanner to find which midpoint equations are active in your chart.
Related Free Tools
Planetary Picture Scanner
The equation view. Scan every midpoint activation in your chart, get decoded A/B = C planetary pictures, and read the Basic Five personal axes.
Uranian Ephemeris
See the Trans-Neptunian points and their midpoints for any date, past or future. A date-driven 90-degree dial and planetary picture scan, stepped one day at a time, no birth data needed.
Harmonic Chart Calculator for Astrology
Calculate a harmonic chart for astrology. Choose H5, H7, H9, or any number 2-180, then inspect conjunction clusters, source aspects, and harmonic positions.
Birth Chart Calculator
Calculate a natal chart with planet placements, houses, aspects, and chart summary.
Compatibility Calculator
Compare two birth charts for synastry aspects and compatibility score.
Frequently Asked Questions
What is a 90-degree dial?
A 90-degree dial is a circular chart that compresses the full 360-degree zodiac into a 90-degree circle. Each zodiac position is folded by dividing by 90 and taking the remainder, so 0° Aries, 0° Cancer, 0° Libra, and 0° Capricorn all land at the same point. This makes hard-aspect symmetries easier to inspect: planets that form conjunctions, squares, and oppositions end up close together on the dial.
What are Trans-Neptunian Points (TNPs)?
Trans-Neptunian Points are eight hypothetical factors used in Uranian astrology, originally defined by Alfred Witte and Friedrich Sieggrün in the 1920s-30s. They are Cupido, Hades, Zeus, Kronos, Apollon, Admetos, Vulcanus, and Poseidon. TNPs are not observed physical objects; they are calculated Hamburg School factors with conventional orbital models. Many Uranian astrologers use them as optional interpretive factors.
How does the 90-degree fold work?
Every zodiac longitude is divided by 90, and the remainder becomes the dial position. A planet at 5° Aries (5°), 5° Cancer (95°), 5° Libra (185°), and 5° Capricorn (275°) all fold to the same 5° position on the dial. This means any planet forming a conjunction, square, or opposition to another will appear near it on the 90-degree dial, grouped into visible clusters.
What is a cluster on the dial?
A cluster is a group of factors (planets, points, or TNPs) whose folded dial positions fall within the selected orb of each other. Clusters highlight places where several hard-aspect relationships share the same 90-degree axis. The tighter the cluster, the more interpretive priority it usually gets, but it should still be checked against the full chart.
What orb should I use?
A 1.5° orb is a practical starting point. Tighter orbs (0.5-1.0°) show fewer, more exact groupings. Wider orbs (2.0-3.0°) reveal more patterns, but some may be less useful. Experiment to see which setting produces clusters you can verify against the rest of the chart.
Keep the dial with the rest of your chart work.
The 90-degree dial is most useful when you can return to it with notes, context, and comparison points. Create a free account to save your chart work and carry the strongest patterns into the Constellation Atlas.