Research summary
Why Planets Appear to Move Backward
- The cited source is used for a specific factual claim.
- The page distinguishes evidence from interpretation.
- The source does not establish astrological causation.
Citation
https://science.nasa.gov/earth/earth-observatory/planetary-motion/
Source overview
NASA describes retrograde as apparent backward movement against the stars. For outer planets, it occurs when faster-moving Earth overtakes them in its orbit.
What the source establishes
The orbital geometry behind apparent retrograde motion.
Limitations
The source supports the astronomy or calendar claim described above. It does not validate astrological personality interpretations or predictive claims.
Practical meaning
This distinction allows Zodiac Calendar to use scientific sources for measurable sky facts while clearly labeling astrological symbolism as interpretation.
Editorial note: Astrological meanings on this page describe established traditions and interpretive frameworks. They are not presented as scientifically demonstrated personality facts.