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Eratosthenes figured out the circumference of the earth this is important because Nasa uses this info everyday.
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He made a set of geographical coordinates, the coordinates are used on a map digitally in modern technology
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Nicolaus discovered the Heliocentric System in the early 15 hundreds, this is important because the Heliocentric system is still used today.
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Tycho discovered the phases of Venus. The phases of Venus is still studied today
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He helped Tycho with his discoveries which is important because we still study his discoveries everyday.
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He Invented the reflecting telescope which is still used today as modern technology
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Albert discovered the photoelectric effect, the photoelectric effect is used everyday.