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APRIL 28, 2017 - General Membership Meeting at 8:00 PM
at the Portage Lakes Kiwanis Civic Center
  725 Portage Lakes Dr
Akron, OH  44319

Click for map and directions

Please note that we ALWAYS encourage the public to attend ANY of our events, including meetings.
Come and enjoy the lecture and talk to us about astronomy!

8:00 PM - Call to order and introduction of tonight's program:


Dr. Daniel Rothstein, Department of Physics, Kent State University


"The Four 'Red' Shifts"


There are four types of frequency shifts in nature. One is the classical Doppler Effect in mechanical mediums, such as sound in air or in water (I will play some examples with train horns) for which it depends whether the source or the observer is moving. Another is the Relativistic (why necessary?) Doppler Effect for electromagnetic waves, which shows up in devices such as Doppler Radar, radar guns, and GPS. As astronomers we see this with light in binary stars, exoplanet detection, and the Hubble Law for nearby galaxies. The third type is the Gravitational Red Shift, which explains why light can't escape from a black hole and the apparent illusion of superluminal velocities in active galactic nuclei. The last type is the Expansion Shift, due to the expanding universe where space expands, often confused with the Doppler Effect for moving objects.

"The universe is there for us to see, but it cannot be understood
without learning its language - mathematics."
  - Galileo Galilei


9:00 PM - Brief coffee-break / discussion time
9:15 PM - Business meeting to be called to order and will include the following:

Meeting Agenda in a Microsoft WORD file


Meeting Agenda in a PDF file

  ●  Treasurer's Report
  ●  Observatory Director's Report
  ●  Calls for observations
  ●  New Business

To contact club officers with questions or comments, please visit our Contacts page
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This page of the ACA Website was last modified on 08/11/17


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