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John Scott started the topic October 27: Principia Talk 9: Lemmas 2, 3, 4 in the forum 2024 Principia Series 23 hours, 53 minutes ago
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John Scott started the topic Principia math talks start October 20 in the forum Announcements 1 week ago
Sunday I’ll begin examining some of the math that Newton covers in his Principia.
The start time and link are the same as before…
Start time: 4pm Mountain, 3pm Pacific.
Link: https://meet.google.com/wgc-jaqo-zmb
If you’d like to join, try to enter the virtual lobby a few minutes ahead of time, and wait for me to let everyone in on the hour. That…[Read more] -
John Scott started the topic Principia math talks start October 20 in the forum Announcements 1 week ago
Sunday I’ll begin examining some of the math that Newton covers in his Principia.
The start time and link are the same as before…
Start time: 4pm Mountain, 3pm Pacific.
Link: https://meet.google.com/wgc-jaqo-zmb
If you’d like to join, try to enter the virtual lobby a few minutes ahead of time, and wait for me to let everyone in on the hour. That…[Read more] -
John Scott started the topic October 20: Principia Talk 8: Lemma 1 in the forum 2024 Principia Series 1 week, 1 day ago
I will begin examining the contents of Newton’s Principia, starting with Lemma 1.
In modern terms, Lemma 1 is about limits and convergence. -
John Scott started the topic October 13: Principia Talk 7: History (part 7) in the forum 2024 Principia Series 1 week, 4 days ago
This talk will cover the emergence of a scientific community in London and Paris, and the tremendous progress in both astronomy and mechanics between Descartes and Newton.
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John Scott started the topic October 6: Principia Talk 6: History (part 6) in the forum 2024 Principia Series 2 weeks, 5 days ago
I will wrap up Galileo’s Two New Sciences and talk a bit about Descartes.
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John Scott started the topic September 29: Principia Talk 5: History (part 5) in the forum 2024 Principia Series 3 weeks, 6 days ago
Placeholder for talk 5
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Mike Witt replied to the topic September 22: Principia Talk 4: History (part 4) in the forum 2024 Principia Series 1 month ago
I think it might be a good idea to always post the link (we had to scrounge around for it last time).
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John Scott replied to the topic September 15: Principia Talk 3: History (part 3) in the forum 2024 Principia Series 1 month ago
After Stefan’s question about Kepler being excommunicated, I went back to re-read this section from my book on Kepler. I reproduced several pages here for anyone interested. [from Voelkel’s Johannes Kepler and the New Astronomy]
When Kepler arrived in Linz in May 1612, he was emotionally exhausted. The splendid intellectual society in the…[Read more]
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John Scott started the topic September 22: Principia Talk 4: History (part 4) in the forum 2024 Principia Series 1 month ago
I’ll continue with what happens after Kepler’s Epitome of Copernican Astronomy.
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John Scott replied to the topic September 8: Principia Talk 2: History (part 2) in the forum 2024 Principia Series 1 month, 1 week ago
Stefan asked a question which I wished I had an answer for about how Kepler determined planetary distances in Cosmographic Mystery. (His 3rd “Law” would relate distances to orbital periods, but he didn’t have that principle yet.) It’s possible that the answer can be gleaned from the outlines for the class I took on this subject. Even if not, some…[Read more]
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John Scott started the topic September 15: Principia Talk 3: History (part 3) in the forum 2024 Principia Series 1 month, 1 week ago
I’ll resume discussion of Kepler writing the manuscript of Astronomia Nova.
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Tina Gilbertson replied to the topic Meeting Updates in the forum 2024 Principia Series 1 month, 2 weeks ago
Looking forward to it!
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John Scott started the topic Principia Talks resume September 8 in the forum Announcements 1 month, 3 weeks ago
Happy long weekend everyone!
I’ve recovered and I plan to resume talks Sunday September 8. If you have questions or comments, we have a new forum thread where you can post them: https://physicscafe.org/topic/meeting-updates/
We plan to post meeting updates there, so it would be a good thread to subscribe to should any further changes come up. -
John Scott started the topic Meeting Updates in the forum 2024 Principia Series 1 month, 3 weeks ago
Subscribe to this thread to learn of changes to our weekly Principia meetings.
Ask questions about the logistics of our meetings here.I plan to resume talks Sunday September 8, 4pm Mountain, 3pm Pacific.
You can click to join sooner, verify your camera is working, and then wait until I let people in.
(I won’t let people in early because we get a…[Read more] -
Tina Gilbertson replied to the topic YouTube vs BunnyNet in the forum Test Forum 2 months ago
Wow, Bunny.net looks pretty darn good. On my computer, the image is sharper than the YouTube video.
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Mike Witt replied to the topic YouTube vs BunnyNet in the forum Test Forum 2 months ago
And this is what John previously posted on YouTube, but I created the the things that links to it, and I’m not sure if I have all the right options here either:
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Mike Witt started the topic YouTube vs BunnyNet in the forum Test Forum 2 months ago
Below is what I got from Bunny.new taking all the default options for everything (which included at least two warnings that I ignored):
And this is what John previously posted on YouTube, but I created the the things that links to it, and I’m not sure if I have all the right options here either:
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John Scott started the topic Next talk postponed to August 25 in the forum Announcements 2 months ago
I’m postponing the next talk to August 25 to give myself more time to prepare. Sorry to do this.
Hope to see you all then. -
John Scott replied to the topic August 11: Principia Talk 1: History in the forum 2024 Principia Series 2 months, 1 week ago
Thanks Tina, I really appreciate that!
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