2009/04/07 by Albert Van Helden · 1 citation
Physics and Astronomy · Arts and Humanities · #History and Developments in Astronomy #Historical Astronomy and Related Studies #History of Science and Medicine #Eyepiece #Telescope #Physics #Optics #Galileo (satellite navigation) #Focal length #Optical telescope #Astronomy #Refracting telescope #Field of view #Lens (geology) #Remote sensing #Geology
paper · pdf · doi:10.1007/s10686-009-9160-y
openalex publication_date 2009/04/07 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/31
The first century of telescopic astronomy can be divided into two periods. During the first, from 1609 to ca. 1640, observations were made with a simple “Dutch” or “Galilean” telescope with a concave eyepiece. Galileo made all his discoveries with this instrument. Its limited field of view, however, made magnifications of more than about 20 impractical, and therefore this instrument’s limit had been reached within a few years. During the second period, ca. 1640–ca. 1700, the simple astronomical telescope came into use, almost immediately augmented with a field lens and an erector lens (the latter used only for terrestrial purposes). Magnifications were increased by increasing the focal lengths of objectives, and this quickly led to very long telescopes, often used without a tube. The astronomical discoveries made possible by this form of the instrument were, however, made with instruments of relatively modest lengths. By the end of the century, very long telescopes fell out of use, while shorter ones were adapted for measurements. Further discoveries became possible only with the reflecting telescope in the second half of the eighteenth century.