archive: Re: SETI Question...

Re: SETI Question...

Dr. H. Paul Shuch ( (no email) )
Tue, 22 Sep 1998 07:32:29 -0400

At 12:40 AM 9/22/98 -0800, Yuri Yuryev wrote:

>So how do you produce a two-dimensional picture out of one signal without
>"wiggling" your dish?

What we are doing is mapping the sky. You don't have to "wiggle" the dish,
since we live on a rotating planet. The earth moves it for us! If you
look at the first image in "What We've Heard So Far"
<> you will see a 3-dimensional
image. Frequency on one axis, right ascention on the other (changed for us
by the earth's rotation), and amplitude of the signal shown as colors.

H. Paul Shuch, Ph.D. Executive Director, The SETI League, Inc.
433 Liberty Street, PO Box 555, Little Ferry NJ 07643 USA
voice (201) 641-1770; fax (201) 641-1771; URL
email work:; home:

"We Know We're Not Alone!"