On May 28, 1807, Swiss paleontologist, glaciologist, and geologist Jean Louis Rodolphe Agassiz was born, who is considered a prominent innovator in the study of the Earth's natural history. He was the first to scientifically propose that the Earth had been subject to a past ice age.
On May 2nd, 1601 (or 1602), German Jesuit scholar Athanasius Kircher was born. He has published most notably in the fields of oriental studies, geology, and medicine, and has been compared to Leonardo da Vinci for his enormous range of interests. He is regarded as one of the founders of Egyptology for his (mostly fruitless) efforts in deciphering Egyptian hieroglyphs, wrote an encyclopedia about China, studied volcanos and fossils, was one of the very first to observe microbes thorough a microscope, and experimented with the laterna magica as a predecessor of photography.
On March 12, 1784, English theologian, geologist and eccentric palaeontologist William Buckland was born, who wrote the first full account of a fossil dinosaur, which he named Megalosaurus.
On November 14, 1797, Charles Lyell, British lawyer and the foremost geologist of his day, was born. Lyell was a close friend to Charles Darwin and is best known as the author of Principles of Geology, which popularised James Hutton's concepts of uniformitarianism – the idea that the earth was shaped by the same processes still in operation today.
On this day in 1804 geographer, naturalist, and explorer Alexander von Humboldt returned home from his great South America scientific discovery journey.