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Who Wrote about Bootstrapping Measurements of the Universe?
Several years ago I read a particularly well written description of how
we use various techniques, parallax, Cepheid variables, ... to estimate distances to celestial objects. I'm trying to recall where. Sagan, Rees, Pagels, Croswell, ..? I'm pretty sure the word bootstrap was a key part of the description. Anyone know? |
#2
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Who Wrote about Bootstrapping Measurements of the Universe?
W. eWatson wrote:
Several years ago I read a particularly well written description of how we use various techniques, parallax, Cepheid variables, ... to estimate distances to celestial objects. I'm trying to recall where. Sagan, Rees, Pagels, Croswell, ..? I'm pretty sure the word bootstrap was a key part of the description. Anyone know? I'm sure that many individuals have written on this topic, and probably all of the above have covered it in one or more expositions. It's a standard astronomy 101 type subject. Google: cosmic distance ladder |
#3
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Who Wrote about Bootstrapping Measurements of the Universe?
Dear W. eWatson:
On Nov 4, 8:29*am, "Greg Neill" wrote: W. eWatson wrote: Several years ago I read a particularly well written description of how we use various techniques, parallax, Cepheid variables, ... to estimate distances to celestial objects. I'm trying to recall where. Sagan, Rees, Pagels, Croswell, ..? I'm pretty sure the word bootstrap was a key part of the description. Anyone know? I'm sure that many individuals have written on this topic, and probably all of the above have covered it in one or more expositions. *It's a standard astronomy 101 type subject. Google: cosmic distance ladder Also "drunkard's walk" David A. Smith |
#4
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Who Wrote about Bootstrapping Measurements of the Universe?
dlzc wrote:
Dear W. eWatson: On Nov 4, 8:29 am, "Greg Neill" wrote: W. eWatson wrote: Several years ago I read a particularly well written description of how we use various techniques, parallax, Cepheid variables, ... to estimate distances to celestial objects. I'm trying to recall where. Sagan, Rees, Pagels, Croswell, ..? I'm pretty sure the word bootstrap was a key part of the description. Anyone know? I'm sure that many individuals have written on this topic, and probably all of the above have covered it in one or more expositions. It's a standard astronomy 101 type subject. Google: cosmic distance ladder Also "drunkard's walk" David A. Smith I don't recall the drunkard's walk being associated with astronomy. Google brings up a book or two and some sites on ranomness. |
#5
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Who Wrote about Bootstrapping Measurements of the Universe?
Greg Neill wrote:
W. eWatson wrote: Several years ago I read a particularly well written description of how we use various techniques, parallax, Cepheid variables, ... to estimate distances to celestial objects. I'm trying to recall where. Sagan, Rees, Pagels, Croswell, ..? I'm pretty sure the word bootstrap was a key part of the description. Anyone know? I'm sure that many individuals have written on this topic, and probably all of the above have covered it in one or more expositions. It's a standard astronomy 101 type subject. Google: cosmic distance ladder That got some good hits. Ladder may be more appropriate than bootstrap. As for as introductory astro texts are concerned, they tend to spread the methods out over the entire book. What I recall was a nice succint description moving up the ladder. |
#6
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Who Wrote about Bootstrapping Measurements of the Universe?
W. eWatson wrote:
Greg Neill wrote: W. eWatson wrote: Several years ago I read a particularly well written description of how we use various techniques, parallax, Cepheid variables, ... to estimate distances to celestial objects. I'm trying to recall where. Sagan, Rees, Pagels, Croswell, ..? I'm pretty sure the word bootstrap was a key part of the description. Anyone know? I'm sure that many individuals have written on this topic, and probably all of the above have covered it in one or more expositions. It's a standard astronomy 101 type subject. Google: cosmic distance ladder That got some good hits. Ladder may be more appropriate than bootstrap. As for as introductory astro texts are concerned, they tend to spread the methods out over the entire book. What I recall was a nice succint description moving up the ladder. Perhaps it was one of Asimov's essays. |
#7
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Who Wrote about Bootstrapping Measurements of the Universe?
"W. eWatson" wrote in message ... Greg Neill wrote: W. eWatson wrote: Several years ago I read a particularly well written description of how we use various techniques, parallax, Cepheid variables, ... to estimate distances to celestial objects. I'm trying to recall where. Sagan, Rees, Pagels, Croswell, ..? I'm pretty sure the word bootstrap was a key part of the description. Anyone know? I'm sure that many individuals have written on this topic, and probably all of the above have covered it in one or more expositions. It's a standard astronomy 101 type subject. Google: cosmic distance ladder That got some good hits. Ladder may be more appropriate than bootstrap. As for as introductory astro texts are concerned, they tend to spread the methods out over the entire book. What I recall was a nice succint description moving up the ladder. http://en.wikipedia.org/wiki/Bootstrapping Tall boots may have a tab, loop or handle at the top known as a bootstrap, allowing one to use fingers or a tool to provide better leverage in pulling the boots on. The saying "to pull yourself up by your bootstraps" was already in use during the 1800s as an example of an impossible task. Bootstrap as a metaphor, meaning to better oneself by one's own unaided efforts, was in use in 1922. This metaphor spawned additional metaphors for a series of self-sustaining processes that proceed without external help. For astronomical distances, bootstrap is more appropriate than ladder because you have no ladder, you have a very short bootstrap, 2 AU, and even that is 182,000,000 miles minor axis and 186,000,000 miles major axis. Astronomical distance estimates have astronomical error bars. |
#8
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Who Wrote about Bootstrapping Measurements of the Universe?
Dear W. eWatson:
On Nov 4, 12:15*pm, "W. eWatson" wrote: dlzc wrote: On Nov 4, 8:29 am, "Greg Neill" wrote: W. eWatson wrote: Several years ago I read a particularly well written description of how we use various techniques, parallax, Cepheid variables, ... to estimate distances to celestial objects. I'm trying to recall where. Sagan, Rees, Pagels, Croswell, ..? I'm pretty sure the word bootstrap was a key part of the description. Anyone know? I'm sure that many individuals have written on this topic, and probably all of the above have covered it in one or more expositions. *It's a standard astronomy 101 type subject. Google: cosmic distance ladder Also "drunkard's walk" I don't recall the drunkard's walk being associated with astronomy. I do. I recall we get distances to objects with multiple methods, then randomly step from those know objects to nearer or farther objects... sort of filling out a web. Google brings up a book or two and some sites on ranomness. Yes, Google failed me too. Poking around on Arxiv.Org, I find the following papers that have nothing to do with random walks or drunkards, but might help you in your quest (and their references might help too). http://arxiv.org/abs/astro-ph/0612666 http://arxiv.org/abs/astro-ph/0607120 http://arxiv.org/abs/astro-ph/0506695 This looks interesting... http://www.santafe.edu/~johnson/fire.ch3.html This is probably too terse... http://www.physics.utah.edu/~springe...tro_review.pdf This is probably closer, starting on page 3... http://www.eastvalleyastronomy.org/nl/nov-2007.pdf Good hunting. David A. Smith |
#9
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Who Wrote about Bootstrapping Measurements of the Universe?
"Greg Neill" ) writes:
W. eWatson wrote: Greg Neill wrote: W. eWatson wrote: Several years ago I read a particularly well written description of how we use various techniques, parallax, Cepheid variables, ... to estimate distances to celestial objects. I'm trying to recall where. Sagan, Rees, Pagels, Croswell, ..? I'm pretty sure the word bootstrap was a key part of the description. Anyone know? I'm sure that many individuals have written on this topic, and probably all of the above have covered it in one or more expositions. It's a standard astronomy 101 type subject. Google: cosmic distance ladder That got some good hits. Ladder may be more appropriate than bootstrap. As for as introductory astro texts are concerned, they tend to spread the methods out over the entire book. What I recall was a nice succint description moving up the ladder. Perhaps it was one of Asimov's essays. The book _Measuring the Universe_ by Stephen Webb has a picture of the ladder (annotated with the various techniques that connect the rungs). --John Park |
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