The next discussion thread is here.
This is a new thread to discuss Eliezer Yudkowsky’s Harry Potter and the Methods of Rationality and anything related to it. This thread is intended for discussing chapter 85. The previous thread has long passed 500 comments. Comment in the 15th thread until you read chapter 85.
There is now a site dedicated to the story at hpmor.com, which is now the place to go to find the authors notes and all sorts of other goodies. AdeleneDawner has kept an archive of Author’s Notes. (This goes up to the notes for chapter 76, and is now not updating. The authors notes from chapter 77 onwards are on hpmor.com.)
The first 5 discussion threads are on the main page under the harry_potter tag. Threads 6 and on (including this one) are in the discussion section using its separate tag system. Also: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15.
As a reminder, it’s often useful to start your comment by indicating which chapter you are commenting on.
Spoiler Warning: this thread is full of spoilers. With few exceptions, spoilers for MOR and canon are fair game to post, without warning or rot13. More specifically:
You do not need to rot13 anything about HP:MoR or the original Harry Potter series unless you are posting insider information from Eliezer Yudkowsky which is not supposed to be publicly available (which includes public statements by Eliezer that have been retracted).
If there is evidence for X in MOR and/or canon then it’s fine to post about X without rot13, even if you also have heard privately from Eliezer that X is true. But you should not post that “Eliezer said X is true” unless you use rot13.
Given that Pioneer fooled around in the Solar System for a while, making flybys of Jupiter and Saturn, our calculation should be a bit different. 1992 is a useful lower bound, which we arrived at by calculating what would happen if Pioneer took a straight path out into interstellar space. In fact, it flew by Saturn in September 1979. A bit of trigonometry tells me that if it left Saturn in a straight line tangent to that planet's orbit, it would probably reach the critical distance some time between '95 and '97, depending on Earth's own position in its orbit. This rough map seems to suggest that it did take that approximate path, but it's hardly accurate. If Pioneer skirted closer to the sun again, inside Saturn's orbit on it's way out then the critical distance comes later, but if it veered away harder then it comes earlier.
I had typed my calculations up, but I lost them just now when I accidentally pressed the back button. Hell's bells and buckets of blood.
Anyway, basically what this tells us is that Quirrel probably has at least a few years of grace before Pioneer gets too far away, if that is in fact what's going on. I think there's a fair likelihood that this theory is correct, but given what I've said here, I don't think the timing of the Pioneer's critical distance should be counted as strong evidence in favour of that.
Thanks for the calculations... I had a rough guess that 6 light-hours was reached some time in the 90s, but didn't know enough about the flight-path to check this.
I believe that the 6 light-hour limit only makes sense as a theory if Quirrell is going to hit it in this school-year (and it explains why it is impossible for him to continue as a teacher next year). If he's still got a few years grace it doesn't work so well, and I suspect that Eliezer would have done a detailed calculation if he was relying on this theory, rather than a rough-and-ready / line... (read more)