Herschel used a systematic method of scanning the sky with his powerful telescope. This was his usual method for searching for comets, and it was during one of these searches that he discovered a peculiar object.
Here's a breakdown of his method:
1. Systematic Observation: Herschel made a habit of meticulously scanning the night sky, meticulously observing and cataloging stars.
2. Telescopic Observation: He utilized his own powerful telescopes, which were significantly more powerful than those available at the time.
3. Observation of a "Star" with Unusual Movement: On March 13, 1781, Herschel noticed an object that didn't behave like a typical star. It had a noticeable disc and appeared to move slowly against the background of stars.
4. Further Observations and Confirmation: Over the next few weeks, Herschel continued to observe the object, tracking its motion and confirming its movement across the sky. This led him to conclude that it was not a star but a new celestial body.
It wasn't until later that astronomers realized the significance of Herschel's discovery: it wasn't a comet or a star, but a new planet, the first one discovered in modern times.
