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4724Re: Steiner's mistake about colored shadows???

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  • happypick2000
    Jan 30, 2008
      --- In steiner@yahoogroups.com, Robert Mason <robertsmason_99@...> wrote:
      >
      > Steve Hale wrote:
      >
      > >>. . . . we are approaching the third lunar
      > eclipse in less than a year, which is quite
      > extraordinary for its occurrence. . . .
      >
      > >>Anyway, it is possible to show by means of
      > its occurrence that the moon, brightly lit in
      > its own respect, actually lights up the umbra,
      > or dark shadow-light of the earth, with a form
      > of brilliance occurring on the opposite side;
      > the reflective side. And this makes the moon
      > take on the orange-brown color of the
      > reflective side.<<
      >
      > Robert writes:
      >
      > I don't get your picture. I don't know what
      > you mean by *the moon, brightly lit in its own
      > respect*. It seems that the moon during a
      > lunar eclipse is not "brightly lit" at all; it
      > is in the earth's shadow and receives no direct
      > sunlight. And I'm not sure what you mean by
      > *the reflective side*. If you mean the earth-
      > side that is facing the sun, I don't think that
      > is orange-brown. The photos that I've seen
      > taken from space show the earth colors as
      > dominated by blue and white; only the desert
      > areas might be close to orange-brown.
      >
      > But, as I think about it, it seems possible
      > that the eclipse colors *might* bear some
      > similarity to the colored shadows that Steiner
      > was talking about in this experimental set-up:
      > <br>
      > <img width="600" height="310"
      > src="http://wn.rsarchive.org/Lectures/LightCrse/images/light7a.gif">
      > <br>
      > (It might not be quite clear from this picture,
      > but only the light from the "left light" passes
      > through the red glass before shining on the
      > pole.)
      >
      > If the orangey color of the moon during a lunar
      > eclipse were to be a "colored shadow" in this
      > sense, then it seems there would have to be a
      > second light source other than the sun.
      > (Assuming the same principle at work, in the
      > case of the eclipse the earth would be the
      > "pole" and the visible side of the moon would
      > be the portion of the screen in the "right
      > shadow".) Since the moon does not appear
      > completely dark during the eclipse, it would
      > seem reasonable to assume that some light is
      > shining on it from somewhere. So, besides the
      > direct sunlight, perhaps there is some other,
      > ambient light, perhaps a combination of
      > starlight and the light from the extended solar
      > "corona"?
      >
      > But to make the analogy fit, this second light
      > in outer space would have to be "white" (i.e.
      > pure light, as is the "right light" in the
      > diagram), and the sunlight would have to be
      > "colored" (as is the "left light" filtered
      > through the "red glass" in the diagram). To
      > complete the analogy, the sunlight would have
      > to be the "complementary color" to the orange-
      > ish of the eclipsed moon; i.e. it would have to
      > be blue-ish. But where in "outer space" is the
      > blue "filter" for the sunlight? -- I don't know
      > of any.
      >
      > So, at first glance the analogy doesn't work.
      > But, at this point, I wouldn't be too quick to
      > conclude that somehow the same principle is not
      > at work in Steiner's experiment and in the
      > lunar eclipse. After all, I still haven't
      > figured out exactly what this "principle" is.
      > I'm still kinda assuming that the colored
      > shadows are "objective" as Steiner said, but I
      > still haven't proven this for myself. I'm
      > somewhat wishing that I had an orderly garage
      > workshop so I could do the experiment for
      > myself, with the narrow tube for viewing as
      > Steiner suggested. Maybe I'll have to break
      > into a high-school physics lab?
      >
      > I'm still very much puzzled by contradictory
      > reports mentioned in the footnotes that I
      > quoted in my first post. This experiment is
      > literally so simple that a child could do it;
      > why hasn't the question of the colored shadows'
      > "objectivity" been settled long ago? -- BTW, I
      > haven't receive a word of reply from JL Benson
      > about this.
      >
      > But maybe some bright, young Goethean physicist
      > will explain the principle at work in colored
      > shadows and go on to apply it to lunar
      > eclipses? Maybe he is reading this thread
      > right now?
      >
      > Robert M
      >
      >
      Dear Friends,

      I am not that bright young Goethean physicist knowledgeable regarding
      technical/scientific aspects of lunar eclipses, but I can describe in
      my own way viewing a total lunar eclipse throughout the moon's full
      transit about 20 years ago. My son and I watched with telescope and
      naked eyes the entire wonder, from beginning to end. This moon was
      copper colored during all phases of its eclipse out here on the coast
      of central California.

      Blessings,
      Sheila
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