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Word: Sir Frederick William Herschel
Part of Speech: Noun (proper noun, as it is a name)
Sir Frederick William Herschel was a famous astronomer from England, originally from Germany. He lived from 1738 to 1822. He is best known for discovering infrared light, which is a type of light that we cannot see but can feel as heat. He also catalogued (made a detailed list of) stars and discovered a planet called Uranus, which is the seventh planet from the Sun.
"Sir Frederick William Herschel discovered infrared light, which helped us understand more about the universe."
In more advanced discussions, you might say: "The contributions of Sir Frederick William Herschel to the field of astronomy were groundbreaking, especially his discovery of Uranus and his work on celestial mechanics."
There are no direct synonyms for a proper noun like "Sir Frederick William Herschel," but you might refer to him as "the astronomer" in a broader context.
Sir Frederick William Herschel is an important figure in the history of astronomy.