Read the three rings
The inner ring holds the natal sky at the recorded birth instant. The middle ring contains secondary progressed planets: one ephemeris day after birth corresponds to one tropical year of life. The outer ring is a true solar arc direction. It moves every natal planet forward by the change in the Sun’s tropical longitude between the natal moment and the secondary progressed moment. The directed Sun must therefore meet the progressed Sun, while a directed Moon or Mercury generally differs from its secondary progressed counterpart.
All three rings are drawn against the same tropical zodiac with 0° Aries at the left. The wheel is an index into the numbers, not a claim that the three sets of planets physically occupied the sky together. The position table gives the longitude of all ten planets in each layer. Below it, separate lists show close major moving-to-natal aspects within one degree. These are geometrical comparisons, not evidence of a future event.
Method choices that affect a comparison
This site calculates the same broad categories independently and displays each as its own ring. It uses the Sun’s true progressed arc, rather than the mean or Naibod arc. A separate solar arc calculator lets you compare the true and mean values directly.
The position engine calculates apparent geocentric tropical longitudes. It rounds the symbolic ephemeris moment to the nearest minute. This page omits Ascendant, Midheaven, and houses: there are several distinct ways to advance or recalculate those points, and the method should never be silently assumed from an ecliptic planet direction. If the birth time or historical UTC offset is uncertain, treat a close Moon contact as uncertain too. Consult the birthplace atlas for historical offset context and verify against a birth record.