From mboxrd@z Thu Jan 1 00:00:00 1970 Path: news.gmane.org!.POSTED.blaine.gmane.org!not-for-mail From: Van L Newsgroups: gmane.emacs.help Subject: Re: Wrong times for sunrise/sunset? Date: Sat, 26 Jan 2019 13:02:44 +1100 Message-ID: <98706E3F-46B2-4C90-AC52-D839434F3BEA@scratch.space> Mime-Version: 1.0 (Mac OS X Mail 9.3 \(3124\)) Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Injection-Info: blaine.gmane.org; posting-host="blaine.gmane.org:195.159.176.226"; logging-data="59598"; mail-complaints-to="usenet@blaine.gmane.org" To: Help Gnu Emacs mailing list Original-X-From: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Sat Jan 26 03:03:28 2019 Return-path: Envelope-to: geh-help-gnu-emacs@m.gmane.org Original-Received: from lists.gnu.org ([209.51.188.17]) by blaine.gmane.org with esmtps (TLS1.0:RSA_AES_256_CBC_SHA1:256) (Exim 4.89) (envelope-from ) id 1gnDJe-000FMA-IR for geh-help-gnu-emacs@m.gmane.org; Sat, 26 Jan 2019 03:03:26 +0100 Original-Received: from localhost ([127.0.0.1]:53852 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gnDJd-0003sZ-K2 for geh-help-gnu-emacs@m.gmane.org; Fri, 25 Jan 2019 21:03:25 -0500 Original-Received: from eggs.gnu.org ([209.51.188.92]:37799) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1gnDJA-0003rR-Of for help-gnu-emacs@gnu.org; Fri, 25 Jan 2019 21:02:57 -0500 Original-Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1gnDJ9-00019b-QU for help-gnu-emacs@gnu.org; Fri, 25 Jan 2019 21:02:56 -0500 Original-Received: from relay12.mail.gandi.net ([217.70.178.232]:51363) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1gnDJ9-0000zs-9c for help-gnu-emacs@gnu.org; Fri, 25 Jan 2019 21:02:55 -0500 Original-Received: from epi.local (193-119-71-194.tpgi.com.au [193.119.71.194]) (Authenticated sender: van@scratch.space) by relay12.mail.gandi.net (Postfix) with ESMTPSA id AE3F4200005 for ; Sat, 26 Jan 2019 02:02:49 +0000 (UTC) X-Mailer: Apple Mail (2.3124) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 217.70.178.232 X-BeenThere: help-gnu-emacs@gnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: Users list for the GNU Emacs text editor List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: help-gnu-emacs-bounces+geh-help-gnu-emacs=m.gmane.org@gnu.org Original-Sender: "help-gnu-emacs" Xref: news.gmane.org gmane.emacs.help:119158 Archived-At: > (I understand that I know very little abot time calculations and such,=20= > and I understand they are difficult. I'd just like to know.) Metwo. Can those calculations tell the diameter of the Sun? without; = observation. In his astronomical writings, Proclus described how the water clock invented by Heron could be used to measure the apparent diameter of the Sun. Proclus's method can be used at the equinox. Water is collected from the clock in a container while the sun rises. As soon as the Sun has risen the water is collected in another container and this measurement continues until sunrise the following day. Then the ratio of the weights of water in the two containers gives the apparent diameter of the Sun. [1] Footnotes =E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2=94=80=E2= =94=80 [1] The link is: =