Path: csiph.com!eternal-september.org!feeder.eternal-september.org!nntp.eternal-september.org!.POSTED!not-for-mail From: Phil Carmody Newsgroups: rec.puzzles Subject: Re: Four more "oldies" Date: Thu, 27 Aug 2026 22:45:13 +0300 Organization: A noiseless patient Spider Lines: 27 Message-ID: <877blb4aba.fsf@asdf.ee> References: <1787507044-4353@newsgrouper.org> <116h3r5$ogjh$1@artemis.inf.ed.ac.uk> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Injection-Date: Thu, 27 Aug 2026 19:45:15 +0000 (UTC) Injection-Info: dont-email.me; logging-data="676350"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX181WwK/SZfrnRpZX80cyX9U"; posting-host="af6c74b12a20a5e4367d677868fd5bba" User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1 (gnu/linux) Cancel-Lock: sha1:iiNW31ww9qPFFLSwxjMbpdYjZQU= sha1:vfRBPR7eUTZfCDFx8v/bCvo0h1E= sha256:goXBgaxb+wbVNJYOzuIFzSLoWfh3HoEy0J8IPl55dak= sha1:4+sgYsl9zQ5Jv0jdLZhXknsN4kg= sha256:CrZ5SZJcvFMQMD2hTTBwYI1KZO4Z9ftoeKvqJR7bdLU= Xref: csiph.com rec.puzzles:28045 richard@cogsci.ed.ac.uk (Richard Tobin) writes: > In article <1787507044-4353@newsgrouper.org>, > James Dow Allen wrote: > >>(1) How much of the Earth's surface is North of latitude 30°N, i.e. the >>thirtieth parallel north. Assume Earth's surface is a perfect sphere. > > This may help (indirectly): > > https://upload.wikimedia.org/wikipedia/commons/a/a6/Cicero_Discovering_the_Tomb_of_Archimedes_by_Benjamin_West.jpeg As expected from 3b1b, this is wonderful: /But why is a sphere's surface area four times its shadow?/ 3Blue1Brown Shared 7 years ago https://youtu.be/watch?v=GNcFjFmqEc8 Phil -- We are no longer hunters and nomads. No longer awed and frightened, as we have gained some understanding of the world in which we live. As such, we can cast aside childish remnants from the dawn of our civilization. -- NotSanguine on SoylentNews, after Eugen Weber in /The Western Tradition/