Retrograde Mars
Below, Earth overtaking Mars on their orbits at seven moments; above, the loop Mars seems to draw against the stars, joined by the sightlines.
The loop is our own motion seen from a moving Earth. Copernicus explained it in 1543.
Below, Earth overtaking Mars on their orbits at seven moments; above, the loop Mars seems to draw against the stars, joined by the sightlines.
The loop is our own motion seen from a moving Earth. Copernicus explained it in 1543.
