They named all the planets after gods. For example, they named Mars after the God of War.
If, as ancient astronomers thought, that our Earth was the center point of rotation for other planets, then it is difficult to explain why those planets would move in a direction opposite to their rotation. Ptolemy came up with a solution that worked, but it was a cumbersome one. Nicolae Copernicus was able to show that this retrograde motion could be explained easily if it were assumed that our Sun was the actual center of rotation of the planets.
The inner planets have been known about since ancient times. Astronomers in Ancient Egypt, Greece and Persia all would have studied the skies and noticed the inner planets. The planets, of course, are completely different to stars, as stars are 'fixed' in the sky (as we look at them, anyway), while planets seem to meander around going nowhere in particular. The odd behaviour led astronomers to attribute this to godly doings...
Astronomers.
Astronomers
An astronomer is a scientist who studies celestial bodies (planets, stars, black holes, moons, nebulae, galaxies).
before the teloscope was invented what were ancient astronomers able to learn about the planets ?
Because the ancient Greek astronomers were one of the first astronomers to discover the planets. As they looked at the planets over time they moved into different places. The planets seemed o orbit the Sun so the Greek astronomers called them planets, which meant :wanderers.
Ancient Roman astronomers named the red planet "Mars," after their god of war because its color reminded them of the blood of a wounded soldier.
Astronomers
Teams of astronomers have studies all possible planets.
Astronomers use a telescope to view planets directly.
microlensing
ancient astronomers thought it was spilled milk.
Jupiter Saturn uranus neptune
Many astronomers, historians, regular people, and scientisis know about the planets in our Solar system.
astronomers
If, as ancient astronomers thought, that our Earth was the center point of rotation for other planets, then it is difficult to explain why those planets would move in a direction opposite to their rotation. Ptolemy came up with a solution that worked, but it was a cumbersome one. Nicolae Copernicus was able to show that this retrograde motion could be explained easily if it were assumed that our Sun was the actual center of rotation of the planets.