Re: Can a sundial disprove Flat Earth?
Perhaps using pylons instead of sundials would convince the flat landers in your Facebook group of their misguided thinking. see: https://www.metabunk.org/soundly-proving-the-curvature-of-the-earth-at-lake-pontchartrain.t8939/ I arrived at this link via the Pylon of the Month website: https://www.pylonofthemonth.org/. It is the featured pylon for Oct. 2018. So, perhaps a whole bunch of sundials laid along the tops of pylons would provide a convincing experiment if you insist on using sundials. cheers. Don Snyder On 6/17/2019 8:04 AM, Dan-George Uza wrote: Hello, In my country there is this growing Flat Earth movement akin to religious fundamentalism. No matter what you throw at them, they simply ignore it. There is even a big group on Facebook of about 5,000 users. I recently joined there for fun. First I thought they were joking, but everybody seems dead serious about it. I nearly got kicked out because my profile photo shows a large armillary sundial which they consider to be a globe So preposterous! :) So I recently wondered: can a sundial can be used to prove the Earth is round? And what would be the simplest gnomonic proof for this? Dan Uza --- https://lists.uni-koeln.de/mailman/listinfo/sundial --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: Can a sundial disprove Flat Earth?
Hi Roger: The Apparent retrograde motion of Mars can be seen with the naked eye. https://en.wikipedia.org/wiki/Apparent_retrograde_motion The math to predict it's orbit is much simpler when the heliocentric system is used. The Antikythera mechanism needed to add Epicyclic gearing to account for the planet motions in the geocentric system. https://en.wikipedia.org/wiki/Epicyclic_gearing https://en.wikipedia.org/wiki/Occam%27s_razor -- Have Fun, Brooke Clarke https://www.PRC68.com http://www.end2partygovernment.com/2012Issues.html axioms: 1. The extent to which you can fix or improve something will be limited by how well you understand how it works. 2. Everybody, with no exceptions, holds false beliefs. Original Message A better question is how could you show _before telescopes were invented_ that the earth orbits the sun rather than the sun orbiting the earth. We all observe that the sun, moon and stars rise and set. Sundial design is the same for geocentric and heliocentric systems. Regards, Roger Bailey Global location: N 48.6°, W 123.4° *From: *Ruud Hooijenga <mailto:r.hooije...@ziggo.nl> *Sent: *June 17, 2019 7:22 AM *To: *kool...@dickkoolish.com <mailto:kool...@dickkoolish.com>; sundial@uni-koeln.de <mailto:sundial@uni-koeln.de> *Subject: *Re: Can a sundial disprove Flat Earth? No, that was not a proof of the globe; just a measurement of its size, assuming the globe. A small, close sun over a flat earth could give the same result for the two locations. However, several other observations had already proved the globe. And you could repeat the Eratosthenes experiment in more than two places, so that the flat earth/local sun assumption would have to be discarded. However, to a dedicated flerfer this will prove nothing, because everything is a NASA hoax (it was even in Eratosthenes' time, apparently). It's no use wrestling a pig - it will only get you dirty, and the pig enjoys it. Rudolf 52-30 N 4-40 E Op 17 juni 2019 om 16:04 schreef kool...@dickkoolish.com: Didn't Eratosthenes show that the earth was round by measuring the diameter? <http://www.avg.com/email-signature?utm_medium=email_source=link_campaign=sig-email_content=oa-4885-a> Virus-free. www.avg.com <http://www.avg.com/email-signature?utm_medium=email_source=link_campaign=sig-email_content=oa-4885-a> <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> --- https://lists.uni-koeln.de/mailman/listinfo/sundial --- https://lists.uni-koeln.de/mailman/listinfo/sundial
RE: Can a sundial disprove Flat Earth?
I am not the first to observe that you can pick any arbitrary spot and declare it to be the center of the universe. I frequently argue that there is nothing wrong with adopting a geocentric view for the purpose of understanding what we see happen in the sky. It is not actually “wrong”, even in an absolute sense. It all depends on what you are want to do. I was also interested to learn that the church did not try to prevent astronomers from using a heliocentric system, which makes astronomical predictions much more accurate and simplifies the calculation, as long as the earth was still central for theological purposes. As for the flat-earthers, I have always assumed that they just enjoy the idea of pretending to believe something obviously absurd. Or maybe it is fun to actually believe something that contradicts all the physical evidence to the contrary. OTOH, I have come to see that there are a lot of politicians and self-declared economists who seem to do the same thing. Jack From: sundial On Behalf Of Roger Sent: Monday, June 17, 2019 11:27 AM To: Ruud Hooijenga ; kool...@dickkoolish.com; sundial@uni-koeln.de Subject: RE: Can a sundial disprove Flat Earth? A better question is how could you show before telescopes were invented that the earth orbits the sun rather than the sun orbiting the earth. We all observe that the sun, moon and stars rise and set. Sundial design is the same for geocentric and heliocentric systems. Regards, Roger Bailey Global location: N 48.6°, W 123.4° From: Ruud Hooijenga <mailto:r.hooije...@ziggo.nl> Sent: June 17, 2019 7:22 AM To: kool...@dickkoolish.com <mailto:kool...@dickkoolish.com> ; sundial@uni-koeln.de <mailto:sundial@uni-koeln.de> Subject: Re: Can a sundial disprove Flat Earth? No, that was not a proof of the globe; just a measurement of its size, assuming the globe. A small, close sun over a flat earth could give the same result for the two locations. However, several other observations had already proved the globe. And you could repeat the Eratosthenes experiment in more than two places, so that the flat earth/local sun assumption would have to be discarded. However, to a dedicated flerfer this will prove nothing, because everything is a NASA hoax (it was even in Eratosthenes' time, apparently). It's no use wrestling a pig - it will only get you dirty, and the pig enjoys it. Rudolf 52-30 N 4-40 E Op 17 juni 2019 om 16:04 schreef kool...@dickkoolish.com <mailto:kool...@dickkoolish.com> : Didn't Eratosthenes show that the earth was round by measuring the diameter? <http://www.avg.com/email-signature?utm_medium=email_source=link_campaign=sig-email_content=oa-4885-a> Virus-free. <http://www.avg.com/email-signature?utm_medium=email_source=link_campaign=sig-email_content=oa-4885-a> www.avg.com --- https://lists.uni-koeln.de/mailman/listinfo/sundial
RE: Can a sundial disprove Flat Earth?
A better question is how could you show before telescopes were invented that the earth orbits the sun rather than the sun orbiting the earth. We all observe that the sun, moon and stars rise and set. Sundial design is the same for geocentric and heliocentric systems. Regards, Roger Bailey Global location: N 48.6°, W 123.4° From: Ruud Hooijenga Sent: June 17, 2019 7:22 AM To: kool...@dickkoolish.com; sundial@uni-koeln.de Subject: Re: Can a sundial disprove Flat Earth? No, that was not a proof of the globe; just a measurement of its size, assuming the globe. A small, close sun over a flat earth could give the same result for the two locations. However, several other observations had already proved the globe. And you could repeat the Eratosthenes experiment in more than two places, so that the flat earth/local sun assumption would have to be discarded. However, to a dedicated flerfer this will prove nothing, because everything is a NASA hoax (it was even in Eratosthenes' time, apparently). It's no use wrestling a pig - it will only get you dirty, and the pig enjoys it. Rudolf 52-30 N 4-40 E Op 17 juni 2019 om 16:04 schreef kool...@dickkoolish.com: Didn't Eratosthenes show that the earth was round by measuring the diameter? --- This email has been checked for viruses by AVG. https://www.avg.com --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: Can a sundial disprove Flat Earth?
No, that was not a proof of the globe; just a measurement of its size, assuming the globe. A small, close sun over a flat earth could give the same result for the two locations.However, several other observations had already proved the globe. And you could repeat the Eratosthenes experiment in more than two places, so that the flat earth/local sun assumption would have to be discarded.However, to a dedicated flerfer this will prove nothing, because everything is a NASA hoax (it was even in Eratosthenes' time, apparently). It's no use wrestling a pig - it will only get you dirty, and the pig enjoys it.Rudolf52-30 N 4-40 EOp 17 juni 2019 om 16:04 schreef kool...@dickkoolish.com: Didn't Eratosthenes show that the earth was round by measuring the diameter? --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: Can a sundial disprove Flat Earth?
Didn't Eratosthenes show that the earth was round by measuring the diameter? - Original Message - From: "Dan-George Uza" To:"Sundial List" Cc: Sent:Mon, 17 Jun 2019 16:04:58 +0300 Subject:Can a sundial disprove Flat Earth? Hello, In my country there is this growing Flat Earth movement akin to religious fundamentalism. No matter what you throw at them, they simply ignore it. There is even a big group on Facebook of about 5,000 users. I recently joined there for fun. First I thought they were joking, but everybody seems dead serious about it. I nearly got kicked out because my profile photo shows a large armillary sundial which they consider to be a globe So preposterous! :) So I recently wondered: can a sundial can be used to prove the Earth is round? And what would be the simplest gnomonic proof for this? Dan Uza --- https://lists.uni-koeln.de/mailman/listinfo/sundial
Re: Can a sundial disprove Flat Earth?
Hello Not sure about doing this with only one sundial but you can (apparently) with two. See SunInfo (www.bit.ly/suninfo) look down the middle column to eight entries down for a light blue box entitled “Using two sundials to destroy the idea of a flat earth!!” Patrick From: Dan-George Uza Sent: Monday, June 17, 2019 2:04 PM To: Sundial List Subject: Can a sundial disprove Flat Earth? Hello, In my country there is this growing Flat Earth movement akin to religious fundamentalism. No matter what you throw at them, they simply ignore it. There is even a big group on Facebook of about 5,000 users. I recently joined there for fun. First I thought they were joking, but everybody seems dead serious about it. I nearly got kicked out because my profile photo shows a large armillary sundial which they consider to be a globe So preposterous! :) So I recently wondered: can a sundial can be used to prove the Earth is round? And what would be the simplest gnomonic proof for this? Dan Uza --- https://lists.uni-koeln.de/mailman/listinfo/sundial --- https://lists.uni-koeln.de/mailman/listinfo/sundial
