Not sure what you mean, once you see something you have discovered it.
Mercury, Venus, Mars, Jupiter and Saturn can all be seen with the naked eye. So no one knows when a person looked into the sky and saw them.
Mercury was discovered visually by looking at the sky shortly before sunrise or shortly after sunset. It was discovered in antiquity.
The planet Mars has been known since ancient times and was observed by early astronomers like the Babylonians, Egyptians, and Greeks. Its discovery is not credited to a single individual or year as it has always been visible to the naked eye in the night sky.
yeah because i just saw a $hit monster in my telescope!
Earth was discovered at the beginning of civilization because mankind was standing on it. Mars was discovered by early intelligent human beings that looked up in the sky one day and saw something red glowing off in the distance and they called it Mars.
John Flamsteed, but he thought it was a star. William Herschel discovered it again later and identified it as a planet.
Mars is primarily made of iron-oxide, or rust. From Earth, Mars looks very red. Early astronomers saw it and thought of blood, therefore naming it after the Roman God of War - Mars. Mars's two moons are named accordingly.
Mars is often referred to as the "Red Planet" due to its reddish appearance caused by iron oxide (rust) on its surface. The ancient Romans named it after their god of war, Mars, because of its reddish color reminiscent of blood.
In "modern times" as we know them, Uranus was the first planet discovered. All the other planets known to then were visible to the naked eye from earth, and, thus, were known to ancients. It is exceptionally dim and moves very slowly in its orbit. Uranus was discovered by William Hershel, who saw it in a telescope and announced his discovery on March 13, 1781. The Neptune was discovered in 1846.
Neptune! There's Mercury, Venus, Earth, Mars, Jupiter Saturn, Uranus, Neptune! I saw Mercury then Venus. I saw the Earth then Mars then Jupiter and then Saturn. Uranus then Neptune!
Mars and Jupiter were last visible from Earth in the early morning sky in November 2021. Jupiter rises before dawn, while Mars is also visible in the eastern sky before sunrise.
Mars. The Italian astronomer Schiaperelli thought he could see "canali" (channels, not actually canals) on the planet's surface. Percival Lowell also "saw" them, and wrote an extensive book on what Mars was probably like because of the "canals". It was determined years later, and proven by the Mars orbiters and landers, that the "canals" were an optical illusion to earth-bound viewers. They don't exist.