Where did Ptolemy compare the Earth to the distance of fixed stars? Planned maintenance scheduled April 23, 2019 at 23:30 UTC (7:30 pm US/Eastern) Announcing the arrival of Valued Associate #679: Cesar Manara Unicorn Meta Zoo #1: Why another podcast?When was the airless void above the earth discovered?Who first distinguished planets from the stars?How Long Did It Take To Prove That The Earth Revolves Around The SunPlanets/stars as more than points of lightWhen did the estimates of planetary distances made between Ptolemy and Copernicus produce the pattern suggesting heliocentrism?Did the ancient Chinese know the earth is a sphere?When was it discovered that the Earth wasn't round?Historical knowledge of Distance of Earth from SunWhen did astronomy first discover that the stars are bigger than the moon?How did Ptolemy calculate the distance to the moon
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Where did Ptolemy compare the Earth to the distance of fixed stars?
Planned maintenance scheduled April 23, 2019 at 23:30 UTC (7:30 pm US/Eastern)
Announcing the arrival of Valued Associate #679: Cesar Manara
Unicorn Meta Zoo #1: Why another podcast?When was the airless void above the earth discovered?Who first distinguished planets from the stars?How Long Did It Take To Prove That The Earth Revolves Around The SunPlanets/stars as more than points of lightWhen did the estimates of planetary distances made between Ptolemy and Copernicus produce the pattern suggesting heliocentrism?Did the ancient Chinese know the earth is a sphere?When was it discovered that the Earth wasn't round?Historical knowledge of Distance of Earth from SunWhen did astronomy first discover that the stars are bigger than the moon?How did Ptolemy calculate the distance to the moon
$begingroup$
I read the following in C. S. Lewis, Miracles (page 77-8)
The immensity of the universe is not a recent discovery. More than seventeen hundred years ago Ptolemy taught that in relation to the distance of the fixed stars the whole Earth must be regarded as a point with no magnitude.
There was no reference given, but I assume this would be in the Almagest. However, I don't know where in that work (or elsewhere) Ptolemy discussed this. I want to read his explanation for that view.
Hence the question: Where did Ptolemy compare the Earth to the distance of fixed stars?
astronomy
asked 2 days ago
Frank HubenyFrank Hubeny
12818
New contributor
Frank Hubeny is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
|
$begingroup$
I read the following in C. S. Lewis, Miracles (page 77-8)
The immensity of the universe is not a recent discovery. More than seventeen hundred years ago Ptolemy taught that in relation to the distance of the fixed stars the whole Earth must be regarded as a point with no magnitude.
There was no reference given, but I assume this would be in the Almagest. However, I don't know where in that work (or elsewhere) Ptolemy discussed this. I want to read his explanation for that view.
Hence the question: Where did Ptolemy compare the Earth to the distance of fixed stars?
astronomy
asked 2 days ago
Frank HubenyFrank Hubeny
12818
New contributor
Frank Hubeny is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
|
$begingroup$
I read the following in C. S. Lewis, Miracles (page 77-8)
The immensity of the universe is not a recent discovery. More than seventeen hundred years ago Ptolemy taught that in relation to the distance of the fixed stars the whole Earth must be regarded as a point with no magnitude.
There was no reference given, but I assume this would be in the Almagest. However, I don't know where in that work (or elsewhere) Ptolemy discussed this. I want to read his explanation for that view.
Hence the question: Where did Ptolemy compare the Earth to the distance of fixed stars?
astronomy
asked 2 days ago
Frank HubenyFrank Hubeny
12818
New contributor
Frank Hubeny is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
I read the following in C. S. Lewis, Miracles (page 77-8)
The immensity of the universe is not a recent discovery. More than seventeen hundred years ago Ptolemy taught that in relation to the distance of the fixed stars the whole Earth must be regarded as a point with no magnitude.
There was no reference given, but I assume this would be in the Almagest. However, I don't know where in that work (or elsewhere) Ptolemy discussed this. I want to read his explanation for that view.
Hence the question: Where did Ptolemy compare the Earth to the distance of fixed stars?
astronomy
astronomy
asked 2 days ago
Frank HubenyFrank Hubeny
12818
New contributor
Frank Hubeny is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 2 days ago
Frank HubenyFrank Hubeny
12818
New contributor
Frank Hubeny is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 2 days ago
Frank HubenyFrank Hubeny
12818
New contributor
Frank Hubeny is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 2 days ago
Frank HubenyFrank Hubeny
12818
asked 2 days ago
Frank HubenyFrank Hubeny
12818
12818
New contributor
Frank Hubeny is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Frank Hubeny is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Frank Hubeny is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
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2 Answers
2
active
oldest
votes
$begingroup$
Almagest, Book 1, chap. 5 contains what you are looking for.
edited yesterday
Danu♦
2,76822246
answered 2 days ago
sand1sand1
91757
$endgroup$
$begingroup$
This basically answered my question where in the Almagest I need to look.
$endgroup$
– Frank Hubeny
2 days ago
5
$begingroup$
Could you please provide a relevant quote from the source? Otherwise, if the link goes dead, your answer is worthless.
$endgroup$
– Thunderforge
yesterday
1
$begingroup$
This passage appears as Book 1 Chapter 6 in Toomer's 1984 English translation cited by the Wikipedia "Almagest" article. My (no-doubt over terse) summary is: "we see no parallax."
$endgroup$
– kimchi lover
yesterday
|
$begingroup$
Ptolemy's argument can be simply explained in plain English. If the distance to stars
was comparable to the size of the Earth, the stars would experience a diurnal parallax, that is the visible relative positions of the stars in the sky would change during one night. But this is not observed.
By the way, a similar argument will imply that if the Earth is rotating about the Sun
(or moves in some other way with respect to stars), the distance to the stars must be much larger than the size of this motion. In particular the diameter of the orbit of the Earth around the Sun is negligible in comparison to the distance to the stars.
This was the most serious argument against the Heliocentric system, and it is also
due to Ptolemy. Until the acceptance of Copernicus theory, people just could not believe that the distance to the stars can be so large. Why would God create such an enormous Universe only to populate a tiny piece of it with humans?
answered 2 days ago
Alexandre EremenkoAlexandre Eremenko
25.9k13695
$endgroup$
$begingroup$
Thank you for confirming that it was parallax and for connecting this to questions about the Heliocentric system.
$endgroup$
– Frank Hubeny
2 days ago
|
2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
$begingroup$
Almagest, Book 1, chap. 5 contains what you are looking for.
edited yesterday
Danu♦
2,76822246
answered 2 days ago
sand1sand1
91757
$endgroup$
$begingroup$
This basically answered my question where in the Almagest I need to look.
$endgroup$
– Frank Hubeny
2 days ago
5
$begingroup$
Could you please provide a relevant quote from the source? Otherwise, if the link goes dead, your answer is worthless.
$endgroup$
– Thunderforge
yesterday
1
$begingroup$
This passage appears as Book 1 Chapter 6 in Toomer's 1984 English translation cited by the Wikipedia "Almagest" article. My (no-doubt over terse) summary is: "we see no parallax."
$endgroup$
– kimchi lover
yesterday
|
$begingroup$
Almagest, Book 1, chap. 5 contains what you are looking for.
edited yesterday
Danu♦
2,76822246
answered 2 days ago
sand1sand1
91757
$endgroup$
$begingroup$
This basically answered my question where in the Almagest I need to look.
$endgroup$
– Frank Hubeny
2 days ago
5
$begingroup$
Could you please provide a relevant quote from the source? Otherwise, if the link goes dead, your answer is worthless.
$endgroup$
– Thunderforge
yesterday
1
$begingroup$
This passage appears as Book 1 Chapter 6 in Toomer's 1984 English translation cited by the Wikipedia "Almagest" article. My (no-doubt over terse) summary is: "we see no parallax."
$endgroup$
– kimchi lover
yesterday
|
$begingroup$
Almagest, Book 1, chap. 5 contains what you are looking for.
edited yesterday
Danu♦
2,76822246
answered 2 days ago
sand1sand1
91757
$endgroup$
Almagest, Book 1, chap. 5 contains what you are looking for.
edited yesterday
Danu♦
2,76822246
answered 2 days ago
sand1sand1
91757
edited yesterday
Danu♦
2,76822246
edited yesterday
Danu♦
2,76822246
edited yesterday
Danu♦
2,76822246
2,76822246
answered 2 days ago
sand1sand1
91757
answered 2 days ago
sand1sand1
91757
answered 2 days ago
sand1sand1
91757
91757
$begingroup$
This basically answered my question where in the Almagest I need to look.
$endgroup$
– Frank Hubeny
2 days ago
5
$begingroup$
Could you please provide a relevant quote from the source? Otherwise, if the link goes dead, your answer is worthless.
$endgroup$
– Thunderforge
yesterday
1
$begingroup$
This passage appears as Book 1 Chapter 6 in Toomer's 1984 English translation cited by the Wikipedia "Almagest" article. My (no-doubt over terse) summary is: "we see no parallax."
$endgroup$
– kimchi lover
yesterday
|
$begingroup$
This basically answered my question where in the Almagest I need to look.
$endgroup$
– Frank Hubeny
2 days ago
5
$begingroup$
Could you please provide a relevant quote from the source? Otherwise, if the link goes dead, your answer is worthless.
$endgroup$
– Thunderforge
yesterday
1
$begingroup$
This passage appears as Book 1 Chapter 6 in Toomer's 1984 English translation cited by the Wikipedia "Almagest" article. My (no-doubt over terse) summary is: "we see no parallax."
$endgroup$
– kimchi lover
yesterday
$begingroup$
This basically answered my question where in the Almagest I need to look.
$endgroup$
– Frank Hubeny
2 days ago
$begingroup$
This basically answered my question where in the Almagest I need to look.
$endgroup$
– Frank Hubeny
2 days ago
5
5
$begingroup$
Could you please provide a relevant quote from the source? Otherwise, if the link goes dead, your answer is worthless.
$endgroup$
– Thunderforge
yesterday
$begingroup$
Could you please provide a relevant quote from the source? Otherwise, if the link goes dead, your answer is worthless.
$endgroup$
– Thunderforge
yesterday
1
1
$begingroup$
This passage appears as Book 1 Chapter 6 in Toomer's 1984 English translation cited by the Wikipedia "Almagest" article. My (no-doubt over terse) summary is: "we see no parallax."
$endgroup$
– kimchi lover
yesterday
$begingroup$
This passage appears as Book 1 Chapter 6 in Toomer's 1984 English translation cited by the Wikipedia "Almagest" article. My (no-doubt over terse) summary is: "we see no parallax."
$endgroup$
– kimchi lover
yesterday
|
$begingroup$
Ptolemy's argument can be simply explained in plain English. If the distance to stars
was comparable to the size of the Earth, the stars would experience a diurnal parallax, that is the visible relative positions of the stars in the sky would change during one night. But this is not observed.
By the way, a similar argument will imply that if the Earth is rotating about the Sun
(or moves in some other way with respect to stars), the distance to the stars must be much larger than the size of this motion. In particular the diameter of the orbit of the Earth around the Sun is negligible in comparison to the distance to the stars.
This was the most serious argument against the Heliocentric system, and it is also
due to Ptolemy. Until the acceptance of Copernicus theory, people just could not believe that the distance to the stars can be so large. Why would God create such an enormous Universe only to populate a tiny piece of it with humans?
answered 2 days ago
Alexandre EremenkoAlexandre Eremenko
25.9k13695
$endgroup$
$begingroup$
Thank you for confirming that it was parallax and for connecting this to questions about the Heliocentric system.
$endgroup$
– Frank Hubeny
2 days ago
|
$begingroup$
Ptolemy's argument can be simply explained in plain English. If the distance to stars
was comparable to the size of the Earth, the stars would experience a diurnal parallax, that is the visible relative positions of the stars in the sky would change during one night. But this is not observed.
By the way, a similar argument will imply that if the Earth is rotating about the Sun
(or moves in some other way with respect to stars), the distance to the stars must be much larger than the size of this motion. In particular the diameter of the orbit of the Earth around the Sun is negligible in comparison to the distance to the stars.
This was the most serious argument against the Heliocentric system, and it is also
due to Ptolemy. Until the acceptance of Copernicus theory, people just could not believe that the distance to the stars can be so large. Why would God create such an enormous Universe only to populate a tiny piece of it with humans?
answered 2 days ago
Alexandre EremenkoAlexandre Eremenko
25.9k13695
$endgroup$
$begingroup$
Thank you for confirming that it was parallax and for connecting this to questions about the Heliocentric system.
$endgroup$
– Frank Hubeny
2 days ago
|
$begingroup$
Ptolemy's argument can be simply explained in plain English. If the distance to stars
was comparable to the size of the Earth, the stars would experience a diurnal parallax, that is the visible relative positions of the stars in the sky would change during one night. But this is not observed.
By the way, a similar argument will imply that if the Earth is rotating about the Sun
(or moves in some other way with respect to stars), the distance to the stars must be much larger than the size of this motion. In particular the diameter of the orbit of the Earth around the Sun is negligible in comparison to the distance to the stars.
This was the most serious argument against the Heliocentric system, and it is also
due to Ptolemy. Until the acceptance of Copernicus theory, people just could not believe that the distance to the stars can be so large. Why would God create such an enormous Universe only to populate a tiny piece of it with humans?
answered 2 days ago
Alexandre EremenkoAlexandre Eremenko
25.9k13695
$endgroup$
Ptolemy's argument can be simply explained in plain English. If the distance to stars
was comparable to the size of the Earth, the stars would experience a diurnal parallax, that is the visible relative positions of the stars in the sky would change during one night. But this is not observed.
By the way, a similar argument will imply that if the Earth is rotating about the Sun
(or moves in some other way with respect to stars), the distance to the stars must be much larger than the size of this motion. In particular the diameter of the orbit of the Earth around the Sun is negligible in comparison to the distance to the stars.
This was the most serious argument against the Heliocentric system, and it is also
due to Ptolemy. Until the acceptance of Copernicus theory, people just could not believe that the distance to the stars can be so large. Why would God create such an enormous Universe only to populate a tiny piece of it with humans?
answered 2 days ago
Alexandre EremenkoAlexandre Eremenko
25.9k13695
edited yesterday
answered 2 days ago
Alexandre EremenkoAlexandre Eremenko
25.9k13695
answered 2 days ago
Alexandre EremenkoAlexandre Eremenko
25.9k13695
answered 2 days ago
Alexandre EremenkoAlexandre Eremenko
25.9k13695
25.9k13695
$begingroup$
Thank you for confirming that it was parallax and for connecting this to questions about the Heliocentric system.
$endgroup$
– Frank Hubeny
2 days ago
|
$begingroup$
Thank you for confirming that it was parallax and for connecting this to questions about the Heliocentric system.
$endgroup$
– Frank Hubeny
2 days ago
$begingroup$
Thank you for confirming that it was parallax and for connecting this to questions about the Heliocentric system.
$endgroup$
– Frank Hubeny
2 days ago
$begingroup$
Thank you for confirming that it was parallax and for connecting this to questions about the Heliocentric system.
$endgroup$
– Frank Hubeny
2 days ago
|
