Areas of Interest:
- History of Astronomy
- Scientific Instruments
Research and Teaching:
I am currently preparing a new edition of my translation of Galileo’s Sidereus Nuncius.
This year I will finish a book on Christiaan Huygens and the telescope.
- The Invention of the Telescope. American Philosophical Society, Transactions, 67 (1977), no 4. Reprinted with a new introduction, Transactions, 98, part 4 (2008)
- Measuring the Universe: Cosmic Dimensions from Aristarchus to Halley. Chicago: University of Chicago Press, 1985.
- Sidereus Nuncius or The Sidereal Messenger (Galileo Galilei). Translated with introduction, conclusion and notes. Chicago: University of Chicago Press, 1989, new editions, 2014.
- The History of Science in the Netherlands. (Leiden: E. J. Brill, 1999), co-edited with L. C. Palm and K. van Berkel