"For it is the duty of an astronomer to compose the history of the celestial motions through careful and expert study"

Nicolaus Copernicus was a 16th century astronomer who is credited with developing the heliocentric design of the universe. In this quote, he is stressing the value of astronomy and the duty of an astronomer to study the celestial motions. He is recommending that it is the astronomer's duty to thoroughly and expertly observe and tape the motions of the stars and worlds in order to create a thorough history of the celestial movements. This quote highlights the importance of astronomy and the requirement for astronomers to be thorough in their research study and observations. It also works as a reminder of the importance of studying the stars and worlds in order to get a much better understanding of the universe. Copernicus' quote is a pointer of the value of astronomy and the need for astronomers to be thorough in their research and observations.