Twilight
Ellipses are a scientific word for the shape of an oval. for example the planets orbits are ellipses.
their orbits
The 8 planets orbit around the Sun, in ellipses.
Kepler did not discover ellipses. In 1605 he discovered that the orbits of the planets were ellipses rather than perfect circles.
ellipses.
Ellipses
ellipses
The first person to do this was Kepler.
Kepler discovered that the planets orbit the sun in oval shaped paths called ellipses.
The planets move intheir ellipticalorbits becauseof the gravitation of the Sun combined withthe inertial velocity of the planets(tangentialto their orbital paths). Mathematics shows the resulting orbits must be ellipses. (Some of the ellipses are in factalmost circles.)
They move around the Sun in ellipses - just like the planets.
Johannes Kepler