Solar Arc Directions Calculator
Solar Arc directions advance every natal planet by the same real arc your progressed Sun has moved since birth — a single shared arc applied chart-wide, computed from your actual secondary-progressed Sun position rather than an assumed average rate.
Because every planet moves by the identical arc regardless of its own natural speed, a slow outer planet like Saturn or Pluto can form a genuinely exact solar-arc contact to a natal point at a specific, calculable age — traditionally read as one of the more precise timing techniques available.
Frequently Asked Questions
What's the difference between solar arc directions and secondary progressions?
Both use the 'a day for a year' principle, but secondary progressions move each planet at its own individual daily rate, while solar arc directions apply a single arc — how far the progressed Sun has moved — equally to every planet and angle.
Why is the solar arc close to 1 degree per year but not exact?
The Sun's real apparent motion varies slightly through the year, so the exact arc depends on your actual birth date rather than a flat 1°-per-year rule.
Do all planets move at the same speed in a solar arc chart?
Yes — every natal planet and angle is shifted forward by the identical arc, unlike secondary progressions where the Moon moves roughly a degree a day and outer planets barely move at all.
What does it mean when a directed planet is exactly conjunct a natal planet?
Traditional astrology reads an exact, near-zero-orb solar arc aspect to a natal point as marking a significant chapter or event window in that year of life.
Do I need my exact birth time for solar arc directions?
Yes — both the progressed Sun's arc and the directed house cusps depend on your natal chart's exact positions and angles.