Evidence and context
Research and Source Library
Plain-language summaries of reputable sources used for astronomy, calendar systems and factual context.
Scope: These sources establish measurable facts about the sky, orbital motion, constellation boundaries or cultural calendars. They do not establish astrological personality claims.
The Ecliptic and the Zodiac
How Earth’s orbital plane creates the Sun’s apparent path and the geometric basis for zodiac coordinates.
How Astronomers Define Constellations
Why constellations are bounded sky regions rather than equal zodiac signs.
Why Planets Appear to Move Backward
The orbital geometry behind apparent retrograde motion.
The Chinese Zodiac Animal Cycle
The twelve animals, lunisolar new-year boundary and five-element cycle.
Editorial method
Each factual claim is matched to a source appropriate to that claim. Interpretive astrology is described as a tradition rather than blended into scientific language.