The wavefront received by a receiver from a moving source, or vice versa, is shown in the literature as circles of decreasing diameter whose centers are displaced along the direction of motion. I have spent some time looking for the proper name, but the nearest one I came across is "Doppler circles," as used by artists. The relevant Wikipedia article shows nice animations of these circles, but no name is mentioned for this group of circles. What is the correct geometrical name for this group of circles?
Perhaps,
"a locus of moving shrinking circles"
or
a locus of shrinking circles moving along a straight line
some links
https://math.stackexchange.com/questions/4503999/shrinking-wedge-of-circles-is-not-a-cw-complex
https://en.wikipedia.org/wiki/Hawaiian_earring
https://math.stackexchange.com/questions/1243151/locus-of-moving-circles-with-changing-radius
@dokov, may I point out a few differences between the group of circles whose name I am trying to find and the objects in the references you kindly suggested? (1) The group of circles I mentioned has their centers fixed while expanding. (2) The spacing between the circumferences in any given angular direction is constant. (3) The first circle will always enclose all the other circles; the second one will always enclose all the circles except the first one, and the third will enclose all except the first and second, and it continues.
https://math.stackexchange.com/questions/4979482/geometrical-name-for-the-group-of-circles-of-decreasing-diameter-whose-centers-a?newreg=2900544ce4c742bf9e6811f0dc07aadc
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