THE CHART EXPLORER / 1800–2100
A moment in time.
A whole sky to explore.
Enter a birth moment—or any date you’re curious about—to calculate planetary signs and aspects. Start by understanding the pieces, then discover how they fit together.
Choose your moment.
Enter the local date and time, then the UTC offset that applied at the birthplace on that date. Historical daylight saving matters. UTC itself uses an offset of 0. Fractional offsets are supported: +05:30 is 5.5 hours. For historical offsets recorded in minutes or seconds, convert the moment to UTC first and enter 0.
Use the actual time and the historical UTC offset at the birthplace.
THE TROPICAL ZODIAC
Signs are equal 30° divisions from the March equinox. The wheel has no houses or ascendant. Planet symbols are offset radially when close together; thin lines mark their true longitudes.
THE PLANETARY POSITIONS
A sky in ten parts.
Positions calculate when the page loads.
| Body | Sign | Position | Motion |
|---|
Retrograde means apparent backward motion as seen from Earth. It is calculated from the change in longitude over 24 hours.
THE GEOMETRY BETWEEN PLANETS
Major aspects
Aspect orbs: conjunction and opposition ±8°, square and trine ±6°, sextile ±4°. These are editorial conventions, not physical boundaries. The wheel highlights aspects within 3°. Aspect interpretation also depends on the planets, signs, and the rest of a chart.
MAKE SENSE OF YOUR CHART
The next step is understanding.
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