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OCA General Meeting
Friday December 14th, Year, 7:30 PM
Chapman University
Free and open to public more

Night of Presentations by Members

Steve Condrey
Steve Condrey

Kyle Coker
Kyle Coker

Steve Condrey
The Development of Astronomy During the Middle Ages and Early Renaissance
Among the topics to be covered:

  • The development of mechanical timekeeping, which would be critical to the development of astronomy as a whole
  • How prohibitions made by the Church against certain lines of Aristotelian thought actually resulted in stimulation of modern scientific thinking
  • Development of the astrolabe, armilliary sphere, and various models of the universe
  • Influences from the Arab world, and the role trade and exploration played in developing astronomy
  • Notable figures from the period
OCA member for 18 years; editor of the Sirius Astronomer from 2003-present; served two terms as a Trustee (2006-2007). Graduate of UC San Diego (1991) with a degree in the history of science, emphasizing medieval and Early Modern scientific development.

Kyle Coker
Watching an Aurora
I have a brief explanation of the Aurora followed by a travelogue of our Alaska trip last year. I end with the photos and video I made of the Aurora.


I've been a member since 2003, just before the great Mars opposition when it was as big as the moon. I'm on the board for I think 4 years now, I'm an observatory holder, and my main interest is astroimaging. I have taught the beginner's class in astrophotography for over 6 years now. I graduated from the University of Texas with a degree in biology and went to medical school at the University of Texas at Galveston. I did my internship and residency at LAC-USC and a hand fellowship in Los Angeles. I have been practicing orthopedic surgery with a specialty in hand surgery in the Laguna Hills area since 1983. I'm married to Diane who is a physical therapist specializing in hand therapy and have 2 grown children Chris and Becky.

Chris Butler will present "What's Up?" in the current evening sky.

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