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September Akron Branch Meeting: “Parallax”, by Tim CampbellDate:
Monday, September 10
Stow Monroe Falls Library
3512 Darrow Road
Stow, OH 44224 US
Center for Inquiry Northeast Ohio
The monthly Akron Branch meeting (PLEASE NOTE, DUE TO LABOR DAY, THIS IS THE SECOND MONDAY), will be Monday September 10, at 7 pm at the Stow-Munroe Falls Public Library and will feature a presentation by amateur astronomer Tim Campbell entitled, Parallax: How Astronomers Have Measured the Distance to the Stars. Tim is also well-known in the Northeast Ohio secular and freethought community. When you look high in any direction in the sky on any given night, you see stars and the constellations to which we assign them. Look in any astronomy book and you will eventually read some sentence that says this star or that star is this or that number of light-years away. But how do astronomers determine those distances? We know that the star we can see with our unaided eye and with telescopes, though similar in apparent magnitude, have vastly different distances from Earth. (The nearest star visible to the unaided eye, other than the Sun, is 4.2 light-years away; the farthest is 7500 light-years distance from us. With telescopes, we can see stars at even greater distances ranging from tens to thousands of light-years away. Galaxies are measured in distances from millions to billions of light-years away.)
How did we come to know these distances? Tim will tell us the answer to this question in his presentation. If you don’t know what is apparent magnitude or a light-year, Tim will certainly be glad to tell you, as well as field any other questions you have after his talk.
Also, as usual, those wishing to continue the discussion after the meeting are invited to join us up the street at the Stow Beef O’Brady’s for drinks/late dinner.
We hope to see many of you there!