Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > comp.lang.python > #70784
| Path | csiph.com!newsfeed.hal-mli.net!feeder3.hal-mli.net!news.stack.nl!newsfeed.xs4all.nl!newsfeed3.news.xs4all.nl!xs4all!newsgate.cistron.nl!newsgate.news.xs4all.nl!post.news.xs4all.nl!not-for-mail |
|---|---|
| Return-Path | <rosuav@gmail.com> |
| X-Original-To | python-list@python.org |
| Delivered-To | python-list@mail.python.org |
| X-Spam-Status | UNSURE 0.236 |
| X-Spam-Level | ** |
| X-Spam-Evidence | '*H*': 0.55; '*S*': 0.02; 'plenty': 0.07; 'integral': 0.09; 'subject: [': 0.09; 'subject:skip:c 10': 0.09; 'cc:addr :python-list': 0.11; 'from:addr:rosuav': 0.16; 'from:name:chris angelico': 0.16; 'triangle': 0.16; 'wrote:': 0.18; 'wed,': 0.18; '(the': 0.22; 'cc:addr:python.org': 0.22; 'planet': 0.24; 'fairly': 0.24; 'cc:2**0': 0.24; 'header:In-Reply-To:1': 0.27; 'point': 0.28; 'message-id:@mail.gmail.com': 0.30; 'that.': 0.31; 'formed': 0.31; "we're": 0.32; 'actual': 0.34; 'subject:the': 0.34; 'could': 0.34; 'anywhere': 0.35; 'but': 0.35; 'received:google.com': 0.35; 'there': 0.35; 'earth': 0.36; 'east': 0.36; 'should': 0.36; 'half': 0.37; 'so,': 0.37; 'pm,': 0.38; 'that,': 0.38; 'enough': 0.39; 'globe.': 0.60; 'back': 0.62; 'times': 0.62; 'such': 0.63; '30,': 0.65; 'distance': 0.65; 'north': 0.65; 'spot': 0.65; 'side': 0.67; 'circle': 0.68; 'research,': 0.68; 'walk': 0.74; 'calculations': 0.84; 'circles': 0.84; 'ethan': 0.84; 'furman': 0.84; 'latitude': 0.84; 'mile': 0.84; 'trig': 0.84; 'cutting': 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:content-transfer-encoding; bh=tIA/se5ZkWM1/Hv7vFHeTvYu/dxbTRTZ93Vc5kQmJX8=; b=wOLl22PorTpilSZKzdfVwhbAvdqXAkaspIAC34dKV/VsaDGZxvGE37EgP3U+fmzNTx qYGGhZH0tBM8UNEeEaRg8x2iF7qXCkWFmJ/0PlXyANSY+aMSpD4NS1r9eeCUAYPAcLpB pjyhkg5bMTRouLQVTjCYt3XCjUwiXLlcGIE5VrZEPrQJ4kxmpDymQ8G0w0joJ7q+y3wP 3VkmFxdnYyEztses8IkXGNMh5cWdEMw8EsRnx4rj1+U9+f1+MgEqXlogfV7GFKvmmkml MlndZ7xM3IRfnsolLmeN0M3XvX25m5wgEkprhoim62bc6OwmOMjVvNmky5ouCQfdJkdQ 4AwQ== |
| MIME-Version | 1.0 |
| X-Received | by 10.220.184.72 with SMTP id cj8mr4175719vcb.10.1398868037192; Wed, 30 Apr 2014 07:27:17 -0700 (PDT) |
| In-Reply-To | <5360F72F.2000102@stoneleaf.us> |
| References | <mailman.9549.1398700831.18130.python-list@python.org> <535f0f9f$0$29965$c3e8da3$5496439d@news.astraweb.com> <roy-DA9493.09383329042014@news.panix.com> <8td53bxud5.ln2@news.ducksburg.com> <ljp9sp$h22$1@ger.gmane.org> <CAPTjJmqya7paQowEkY7-pfsSynybEYTVgC2QTbviX5DWc8VHUg@mail.gmail.com> <5360F72F.2000102@stoneleaf.us> |
| Date | Thu, 1 May 2014 00:27:17 +1000 |
| Subject | Re: Off-topic circumnavigating the earth in a mile or less [was Re: Significant digits in a float?] |
| From | Chris Angelico <rosuav@gmail.com> |
| Cc | "python-list@python.org" <python-list@python.org> |
| Content-Type | text/plain; charset=UTF-8 |
| Content-Transfer-Encoding | quoted-printable |
| X-Mailman-Approved-At | Wed, 30 Apr 2014 18:38:36 +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 <python-list.python.org> |
| List-Unsubscribe | <https://mail.python.org/mailman/options/python-list>, <mailto:python-list-request@python.org?subject=unsubscribe> |
| List-Archive | <http://mail.python.org/pipermail/python-list/> |
| List-Post | <mailto:python-list@python.org> |
| List-Help | <mailto:python-list-request@python.org?subject=help> |
| List-Subscribe | <https://mail.python.org/mailman/listinfo/python-list>, <mailto:python-list-request@python.org?subject=subscribe> |
| Newsgroups | comp.lang.python |
| Message-ID | <mailman.9612.1398875917.18130.python-list@python.org> (permalink) |
| Lines | 34 |
| NNTP-Posting-Host | 2001:888:2000:d::a6 |
| X-Trace | 1398875917 news.xs4all.nl 2867 [2001:888:2000:d::a6]:36112 |
| X-Complaints-To | abuse@xs4all.nl |
| Xref | csiph.com comp.lang.python:70784 |
Show key headers only | View raw
On Wed, Apr 30, 2014 at 11:14 PM, Ethan Furman <ethan@stoneleaf.us> 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. > > > It is my contention, completely unbacked by actual research, that if you > find such a spot (heading a mile east takes you an integral number of times > around the pole), that there is not enough Earth left to walk a mile north > so that you could then turn-around a walk a mile south to get back to such a > location. The circle where the distance is exactly one mile will be fairly near the south pole. There should be plenty of planet a mile to the north of that. If the earth were a perfect sphere, the place we're looking for is the place where cutting across the sphere is 1/π miles. The radius of the earth is approximately 4000 miles (give or take). So we're looking for the place where the chord across a radius 4000 circle is 1/π; that means the triangle formed by a radius of the earth and half of 1/π and an unknown side (the distance from the centre of the earth to the point where the chord meets it - a smidge less than 4000, but the exact distance is immaterial) is a right triangle. Trig functions to the rescue! We want latitude 90°-(asin 1/8000π). It's practically at the south pole: 89.9977° south (89°59'52"). Are my calculations correct? ChrisA
Back to comp.lang.python | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
Significant digits in a float? Roy Smith <roy@panix.com> - 2014-04-28 12:00 -0400
Re: Significant digits in a float? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-04-29 02:34 +0000
Re: Significant digits in a float? Ben Finney <ben@benfinney.id.au> - 2014-04-29 13:23 +1000
Re: Significant digits in a float? Steven D'Aprano <steve@pearwood.info> - 2014-04-29 05:43 +0000
Re: Significant digits in a float? Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2014-04-29 20:33 -0400
Re: Significant digits in a float? Roy Smith <roy@panix.com> - 2014-04-29 20:42 -0400
Re: Significant digits in a float? Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2014-04-30 20:02 -0400
Re: Significant digits in a float? Mark H Harris <harrismh777@gmail.com> - 2014-04-30 22:54 -0500
Re: Significant digits in a float? Paul Rubin <no.email@nospam.invalid> - 2014-04-30 20:56 -0700
Re: Significant digits in a float? Mark H Harris <harrismh777@gmail.com> - 2014-04-30 23:16 -0500
Re: Significant digits in a float? William Ray Wing <wrw@mac.com> - 2014-05-01 11:53 -0400
Re: Significant digits in a float? Mark H Harris <harrismh777@gmail.com> - 2014-05-06 11:29 -0500
Re: Significant digits in a float? Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2014-05-01 22:06 -0400
Re: Significant digits in a float? Mark H Harris <harrismh777@gmail.com> - 2014-05-06 09:51 -0500
Re: Significant digits in a float? alister <alister.nospam.ware@ntlworld.com> - 2014-05-06 15:18 +0000
Re: Significant digits in a float? Joel Goldstick <joel.goldstick@gmail.com> - 2014-05-06 12:14 -0400
Re: Significant digits in a float? Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2014-05-06 19:48 -0400
Re: Significant digits in a float? Roy Smith <roy@panix.com> - 2014-05-01 08:56 -0400
Re: Significant digits in a float? Larry Hudson <orgnut@yahoo.com> - 2014-05-01 12:51 -0700
Re: Significant digits in a float? Adam Funk <a24061@ducksburg.com> - 2014-05-01 22:05 +0100
Re: Significant digits in a float? Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2014-05-01 21:47 -0400
Re: Significant digits in a float? Mark H Harris <harrismh777@gmail.com> - 2014-05-06 09:59 -0500
[OT] Silde rules [was Re: Significant digits in a float?] Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-05-06 16:10 +0000
Re: [OT] Silde rules Ben Finney <ben@benfinney.id.au> - 2014-05-07 10:01 +1000
Re: Significant digits in a float? Adam Funk <a24061@ducksburg.com> - 2014-05-01 21:55 +0100
Re: Significant digits in a float? Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2014-05-01 22:26 -0400
Re: Significant digits in a float? Adam Funk <a24061@ducksburg.com> - 2014-05-08 20:58 +0100
Re: Significant digits in a float? Roy Smith <roy@panix.com> - 2014-04-29 09:38 -0400
Re: Significant digits in a float? Chris Angelico <rosuav@gmail.com> - 2014-04-30 02:30 +1000
Re: Significant digits in a float? Roy Smith <roy@panix.com> - 2014-04-29 19:53 -0400
Re: Significant digits in a float? Chris Angelico <rosuav@gmail.com> - 2014-04-30 10:13 +1000
Re: Significant digits in a float? Ben Finney <ben@benfinney.id.au> - 2014-04-30 10:13 +1000
Re: Significant digits in a float? Chris Angelico <rosuav@gmail.com> - 2014-04-30 10:17 +1000
Re: Significant digits in a float? Ben Finney <ben@benfinney.id.au> - 2014-04-30 10:20 +1000
Re: Significant digits in a float? Grant Edwards <invalid@invalid.invalid> - 2014-04-30 18:19 +0000
Re: Significant digits in a float? Ned Batchelder <ned@nedbatchelder.com> - 2014-04-29 12:47 -0400
Re: Significant digits in a float? Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2014-04-30 09:45 +1200
Re: Significant digits in a float? Chris Angelico <rosuav@gmail.com> - 2014-04-30 02:59 +1000
Re: Significant digits in a float? Adam Funk <a24061@ducksburg.com> - 2014-04-29 21:16 +0100
Re: Significant digits in a float? Mark H Harris <harrismh777@gmail.com> - 2014-04-29 15:39 -0500
Re: Significant digits in a float? Chris Angelico <rosuav@gmail.com> - 2014-04-30 07:15 +1000
Re: Significant digits in a float? Ryan Hiebert <ryan@ryanhiebert.com> - 2014-04-29 15:42 -0500
Re: Significant digits in a float? emile <emile@fenx.com> - 2014-04-29 15:42 -0700
Re: Significant digits in a float? alister <alister.nospam.ware@ntlworld.com> - 2014-04-30 09:03 +0000
Re: Significant digits in a float? Grant Edwards <invalid@invalid.invalid> - 2014-04-30 18:21 +0000
Re: Significant digits in a float? emile <emile@fenx.com> - 2014-05-01 09:34 -0700
Re: Significant digits in a float? alister <alister.nospam.ware@ntlworld.com> - 2014-05-01 17:13 +0000
Re: Significant digits in a float? Chris Angelico <rosuav@gmail.com> - 2014-04-30 08:51 +1000
Re: Significant digits in a float? Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2014-04-30 20:14 +1200
Re: Significant digits in a float? Chris Angelico <rosuav@gmail.com> - 2014-04-30 18:27 +1000
Re: Significant digits in a float? Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-04-30 14:05 +0100
Re: Significant digits in a float? Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-04-30 00:34 +0100
Re: Significant digits in a float? Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2014-04-29 20:37 -0400
Re: Significant digits in a float? Roy Smith <roy@panix.com> - 2014-04-29 20:45 -0400
Re: Significant digits in a float? Chris Angelico <rosuav@gmail.com> - 2014-04-30 10:45 +1000
Re: Significant digits in a float? Roy Smith <roy@panix.com> - 2014-04-29 20:48 -0400
Re: Significant digits in a float? Ethan Furman <ethan@stoneleaf.us> - 2014-04-29 19:31 -0700
Re: Significant digits in a float? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-04-30 02:59 +0000
Re: Significant digits in a float? Roy Smith <roy@panix.com> - 2014-04-29 23:30 -0400
Re: Significant digits in a float? Chris Angelico <rosuav@gmail.com> - 2014-04-30 13:40 +1000
Re: Significant digits in a float? Chris Angelico <rosuav@gmail.com> - 2014-04-30 13:03 +1000
Re: Significant digits in a float? Roy Smith <roy@panix.com> - 2014-04-30 08:01 -0400
Off-topic circumnavigating the earth in a mile or less [was Re: Significant digits in a float?] Ethan Furman <ethan@stoneleaf.us> - 2014-04-30 06:14 -0700
Re: Off-topic circumnavigating the earth in a mile or less [was Re: Significant digits in a float?] Ethan Furman <ethan@stoneleaf.us> - 2014-04-30 07:02 -0700
Re: Off-topic circumnavigating the earth in a mile or less Adam Funk <a24061@ducksburg.com> - 2014-05-01 21:52 +0100
Re: Off-topic circumnavigating the earth in a mile or less [was Re: Significant digits in a float?] Chris Angelico <rosuav@gmail.com> - 2014-05-01 00:27 +1000
Re: Off-topic circumnavigating the earth in a mile or less [was Re: Significant digits in a float?] Chris Angelico <rosuav@gmail.com> - 2014-05-01 05:10 +1000
Re: Off-topic circumnavigating the earth in a mile or less [was Re: Significant digits in a float?] Ryan Hiebert <ryan@ryanhiebert.com> - 2014-04-30 10:24 -0500
Re: Off-topic circumnavigating the earth in a mile or less [was Re: Significant digits in a float?] Ian Kelly <ian.g.kelly@gmail.com> - 2014-04-30 17:46 -0600
Re: Off-topic circumnavigating the earth in a mile or less [was Re: Significant digits in a float?] Terry Reedy <tjreedy@udel.edu> - 2014-04-30 22:20 -0400
Re: Off-topic circumnavigating the earth in a mile or less [was Re: Significant digits in a float?] Gregory Ewing <greg.ewing@canterbury.ac.nz> - 2014-05-01 18:16 +1200
Re: Off-topic circumnavigating the earth in a mile or less Adam Funk <a24061@ducksburg.com> - 2014-05-01 21:57 +0100
Re: Off-topic circumnavigating the earth in a mile or less Mark Lawrence <breamoreboy@yahoo.co.uk> - 2014-05-01 22:49 +0100
Re: Off-topic circumnavigating the earth in a mile or less alister <alister.nospam.ware@ntlworld.com> - 2014-05-02 08:49 +0000
Re: Off-topic circumnavigating the earth in a mile or less [was Re: Significant digits in a float?] Chris Angelico <rosuav@gmail.com> - 2014-05-01 11:57 +1000
Re: Off-topic circumnavigating the earth in a mile or less [was Re: Significant digits in a float?] Vlastimil Brom <vlastimil.brom@gmail.com> - 2014-05-01 09:49 +0200
Re: Significant digits in a float? Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-04-30 02:50 +0000
Re: Significant digits in a float? Grant Edwards <invalid@invalid.invalid> - 2014-04-30 18:18 +0000
csiph-web