AstroLab
Appearances can deceive
Discover why a small body can hide the Sun, why Mars seems to move backwards and how we measure the depth of the stars.
3 min 26 s · Interactive subtitled film
Takeaway: An apparent alignment reveals neither true size nor distance.
Useful background
Day and night; Earth and planets orbiting the Sun.
How does moving the viewpoint reveal depth?
The journey · 6 chapters
- How the Moon hides the Sun
- Distance changes appearances
- Why Mars seems to reverse
- Constellations have depth
- Measuring with a change of viewpoint
- What light tells us
Why explore it?
French and English subtitles. Adjustable playback speed, free navigation and sequence reframing. AI-assisted editorial review.