What solar arc directions are
Solar arc directions are one of the most widely used methods of predictive astrology. The idea is simple: the entire natal chart symbolically turns forward through the zodiac. Every planet, the Ascendant, the MC and all house cusps move by the same distance — the solar arc. The aspects between planets inside the directed chart do not change, because the whole chart moves as one. What changes is something else: one by one, directed points reach the natal planets and angles and form aspects with them. Those aspects describe the turning points of life.
How the solar arc is calculated
The arc is taken from secondary progressions, where one day after birth corresponds to one year of life. The calculator finds the position of the progressed Sun for the chosen date and subtracts the natal Sun from it — the difference is the solar arc. Every natal point is moved by exactly that amount, so the directed Sun always coincides with the progressed Sun.
The Sun's real daily motion ranges from 57' to 61': in winter, near perihelion, the Sun moves faster, in summer slower. That is why the arc only roughly equals your age in degrees: at 30 it may be 29° or more than 30°. The "one degree a year" rule is fine for a rough estimate, but dating events needs an exact ephemeris calculation — which is what the Astrokolo calculator does with the Swiss Ephemeris.
What directions show
Directions describe major stages and milestones: a change of job or profession, a move, marriage or divorce, the birth of children, important people entering or leaving your life, sharp changes in status. It is a method of "outer" time — it captures the events that are visible in a biography. The directed planet shows which force comes into play, and the natal point it touches shows the area of life where it happens: through the house that point occupies and the houses it rules.
A few examples. Directed Jupiter conjunct the natal MC often coincides with professional growth and recognition. Directed Saturn square the natal Sun is a period of responsibility, pressure and growing up. The directed MC reaching natal Venus often brings pleasant events in career or relationships. A separate theme is the directed Ascendant or MC changing sign: it marks a change in behaviour or in the course of life.
How long the influence lasts
Directed points move about one degree a year, so an orb in degrees turns into time in years. With a 1° orb, an aspect builds up about a year before it is exact and fades over the year after: a single aspect works for roughly one to two years and is felt most strongly near exactness. That is why directions do not describe the events of a particular week — they set the theme of a stretch of life. You can adjust direction orbs in your profile.
How to read directions
Start with what matters most. The strongest directions are those to the angles of the chart (Ascendant, MC, and also the Descendant and IC) and to the Sun and Moon, followed by the ruler of the Ascendant. Among the aspects, conjunctions, oppositions and squares lead: they coincide with events and changes. Trines and sextiles more often mean opportunities you have to take yourself. Look at which planet is acting, which of the natal houses it enters and which houses it rules. A single direction rarely decides everything — what counts is several directions pointing to the same theme.
Directions to the Ascendant and MC need an accurate birth time. The angles shift by about one degree for every four minutes of clock time, so a four-minute error moves the timing of events by about a year. If you know the dates of a few important past events, compare them with the directions to the angles — it is a good way to check your birth time.
How to combine directions with other methods
Directions show what is building up and give a one-to-two-year frame. Transits of the slow planets narrow the timing down to months and weeks: an event is most likely when a transit touches the same point as a direction. The solar return for the year shows how that theme unfolds over a specific twelve months. Secondary progressions describe inner readiness — the mood, values and needs you bring to the event. The more methods point to one theme, the more confident the forecast.
Where to start
Open the directions calculator, enter your birth data and keep today's date. The inner wheel is your natal chart, the outer one the directed chart. In the table, find the aspects with the smallest orb: those are the themes active now. Then drag the date with the scrubber a few years forward and back — you will see when each aspect becomes exact and can match past directions with the events of your life.