Zodiac signs and constellations
Compare an equal tropical sign with the astronomical constellation behind the Sun. The two systems use different boundaries, so their labels can differ on the same date.
Your inputs
Start with the example values, then replace them with your own. For tables, keep the vertical bar separators and use a dot for decimals.
This simplified educational calculation has stated assumptions. Do not use it for navigation, engineering safety or other safety-critical decisions.
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Result and workspace
Use the start button to open your result or activity.
How it works
At 12:00 UTC on the selected date, compare the Sun’s equal 30° tropical sign with its astronomical constellation using constellation boundaries.
Worked example
These sample results use the original example inputs in the form. They do not change when you edit your inputs; your own result appears in the workspace.
| Reference instant | Tropical sign | Astronomical constellation |
|---|---|---|
| 2026-10-06T12:00:00.000Z | Libra | Virgo |
Read the result carefully
Results depend on the values and assumptions shown above. Change one input at a time to see its effect. A blank or unavailable result means the data does not support a calculation; it is not zero.
Astrology is a cultural and entertainment framework, not a scientifically validated way to predict personality, health, relationships or future events. Astronomical positions do not validate astrological interpretations.
Data and calculation sources
Astronomy Engine 2.1.19 (MIT) · GeoNames (CC BY 4.0) · IANA
Geocentric tropical positions use Astronomy Engine. House options are equal and whole-sign only. City coordinates are approximate city centers from GeoNames, downloaded on 6 October 2026. Choose precise coordinates when available. Supported birth years: 1900–2100.