Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!news.albasani.net!rt.uk.eu.org!newsfeed.xs4all.nl!newsfeed4.news.xs4all.nl!xs4all!post.news.xs4all.nl!not-for-mail Return-Path: X-Original-To: python-list@python.org Delivered-To: python-list@mail.python.org X-Spam-Status: UNSURE 0.404 X-Spam-Level: **** X-Spam-Evidence: '*H*': 0.34; '*S*': 0.15; 'correct,': 0.09; 'lost.': 0.09; 'cc:addr:python-list': 0.11; 'east,': 0.16; 'from:addr:rosuav': 0.16; 'from:name:chris angelico': 0.16; 'wrote:': 0.18; 'wed,': 0.18; 'cc:addr:python.org': 0.22; 'cc:2**0': 0.24; 'header:In-Reply-To:1': 0.27; 'point': 0.28; 'chris': 0.29; 'message-id:@mail.gmail.com': 0.30; 'another': 0.32; 'could': 0.34; 'anywhere': 0.35; 'york': 0.35; 'but': 0.35; 'received:google.com': 0.35; 'earth': 0.36; 'impression': 0.36; 'east': 0.36; "i'll": 0.36; 'subject:?': 0.36; 'so,': 0.37; 'city.': 0.38; 'pm,': 0.38; 'that,': 0.38; 'globe.': 0.60; 'new': 0.61; 'times': 0.62; '30,': 0.65; 'north': 0.65; 'circle': 0.68; 'challenge.': 0.84; 'circle,': 0.84; 'circles': 0.84; 'east)': 0.84; 'ethan': 0.84; 'furman': 0.84; 'geography': 0.84; 'mile': 0.84; 'pole': 0.84; 'north,': 0.91; 'thing,': 0.91; 'to:none': 0.92 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:date:message-id:subject:from:cc :content-type; bh=bqfscp6ycexQEr3/jPVUui1p51A9I9YTElsNJF0gF0Q=; b=hJHgb239vtRbYvgcEbz2iY+NPYUTupZDhKIsIYSADUXfVL/gZzIcVwoa5WQWPAufUv O6CcotKPLZZwJQ8eIJOO7Amb/jJCqHYsht6piXR7fXWB623AssJ5NCFAeVmzsQhZ/1sz 9mQtx0efz8/FDNslr42Ht0qjNzC5019O6qrPumFKs3DiPOB4qoFg+duMOFLTFM9rbn15 mf513aBjsFfFcW3ha8SJKMT5zmrF0qWADdu52S8sgbDjyhYrDj9ySm02GfoxsDr5DYNA J88TUFs6YEUF9T2kMIGo7CoLxfH6Z5SfkS9kT1IeZqyFhbccdgXShRolYUaq6e5ZqBb0 3YfQ== MIME-Version: 1.0 X-Received: by 10.220.105.130 with SMTP id t2mr1476028vco.18.1398827024794; Tue, 29 Apr 2014 20:03:44 -0700 (PDT) In-Reply-To: <53606083.4000509@stoneleaf.us> References: <535f0f9f$0$29965$c3e8da3$5496439d@news.astraweb.com> <8td53bxud5.ln2@news.ducksburg.com> <53606083.4000509@stoneleaf.us> Date: Wed, 30 Apr 2014 13:03:44 +1000 Subject: Re: Significant digits in a float? From: Chris Angelico Cc: "python-list@python.org" Content-Type: text/plain; charset=UTF-8 X-Mailman-Approved-At: Wed, 30 Apr 2014 06:52:54 +0200 X-BeenThere: python-list@python.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: General discussion list for the Python programming language List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Newsgroups: comp.lang.python Message-ID: Lines: 23 NNTP-Posting-Host: 2001:888:2000:d::a6 X-Trace: 1398833574 news.xs4all.nl 2893 [2001:888:2000:d::a6]:47251 X-Complaints-To: abuse@xs4all.nl Xref: csiph.com comp.lang.python:70762 On Wed, Apr 30, 2014 at 12:31 PM, Ethan Furman wrote: > On 04/29/2014 03:51 PM, Chris Angelico wrote: >> Any point where the mile east takes you an exact number of times >> around the globe. So, anywhere exactly one mile north of that, which >> is a number of circles not far from the south pole. > > Perhaps my geography is rusty, but I was under the impression that one > cannot travel south if one is at the South Pole (axial, not magnetic). Correct, but there's a place not far from the South Pole where the circumference of the earth (travelling east) will be exactly one mile. I could calculate where that would be on a perfect sphere, but earth isn't, so I'll just say "near the South Pole". If you start exactly one mile north of that circle, then you can accomplish the original challenge. Also, if your mile east takes you exactly twice around the circumference, you still achieve the same thing, so there's another circle (one mile north of *that* circle), and another at the three-times-around circle, etc. But I think a better answer is New York City. You start out lost, you go a mile south, a mile east, a mile north, and you are again lost. ChrisA