From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mp10.migadu.com ([2001:41d0:2:bcc0::]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) by ms5.migadu.com with LMTPS id eNn/A1Ob0mO9uAAAbAwnHQ (envelope-from ) for ; Thu, 26 Jan 2023 16:25:07 +0100 Received: from aspmx1.migadu.com ([2001:41d0:2:bcc0::]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) by mp10.migadu.com with LMTPS id uOYIA1Ob0mPKLgEAG6o9tA (envelope-from ) for ; Thu, 26 Jan 2023 16:25:07 +0100 Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by aspmx1.migadu.com (Postfix) with ESMTPS id E25B69E7F for ; Thu, 26 Jan 2023 16:25:05 +0100 (CET) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1pL46J-0006KL-5E; Thu, 26 Jan 2023 10:23:43 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pL46H-0006KD-58 for emacs-orgmode@gnu.org; Thu, 26 Jan 2023 10:23:41 -0500 Received: from mout02.posteo.de ([185.67.36.66]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1pL46D-0002jt-F7 for emacs-orgmode@gnu.org; Thu, 26 Jan 2023 10:23:40 -0500 Received: from submission (posteo.de [185.67.36.169]) by mout02.posteo.de (Postfix) with ESMTPS id 80B4C2409B8 for ; Thu, 26 Jan 2023 16:23:35 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=posteo.net; s=2017; t=1674746615; bh=PczSUS8WE+XnmyctECCfUt6t3PkXu9fxe3m3/gFavaU=; h=From:To:Cc:Subject:Date:From; b=iD+Tuo9BQIS4i425dXsRiMXxBqp9qewSkdQ25ZAuk+/ikJWPG0D1aW+xLte/AjjpZ rkUx9/hO4HrFRdoFiNtt9uA643hSOrZOXGWOLCbayCmD0Bvz8kSotlplBRNsmWB/NG R+hRqx1WfrFI8kaqjdiPnQgdZ8thNargKUIbVx5FMOTTBhmmyJxcs1S1mM0LyAd1c3 DhIJAU4CJWjI2cgZ0L2hk5OnSGtTn4n+ACjHgalAEglCHyhhNdSEHArfiGB8cqKdG8 kskhgTK0uYF0ZgBkadQRCfr3UnqyNa7yC57Hotiu2JZgwzkLUY/hwZtE9NHps41bC4 tFHjL3liASHHw== Received: from customer (localhost [127.0.0.1]) by submission (posteo.de) with ESMTPSA id 4P2kxf5DrJz6tnw; Thu, 26 Jan 2023 16:23:34 +0100 (CET) From: Ihor Radchenko To: Tom Gillespie Cc: Org-mode , Carsten Dominik Subject: Org mode timestamps on the Moon ;] (was: [FEATURE REQUEST] Timezone support in org-mode datestamps and org-agenda) In-Reply-To: References: Date: Thu, 26 Jan 2023 15:24:09 +0000 Message-ID: <87bkmluxnq.fsf@localhost> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Received-SPF: pass client-ip=185.67.36.66; envelope-from=yantar92@posteo.net; helo=mout02.posteo.de X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: emacs-orgmode@gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "General discussions about Org-mode." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: emacs-orgmode-bounces+larch=yhetil.org@gnu.org Sender: emacs-orgmode-bounces+larch=yhetil.org@gnu.org X-Migadu-Flow: FLOW_IN X-Migadu-Country: US ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=yhetil.org; s=key1; t=1674746706; h=from:from:sender:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:list-id:list-help: list-unsubscribe:list-subscribe:list-post:dkim-signature; bh=PczSUS8WE+XnmyctECCfUt6t3PkXu9fxe3m3/gFavaU=; b=MH5tenlZ2pZof17z2omopoGW13J63X0ZrWMovjG81rWkNWXiH6LXPg7gf1jDZU3QlRj7ef QJ9icbzspTXzrPTjoLyCQabPvkJXAy4FVPmIdltAoFsdkcn6K3bGC3ZheUguw1yg3VRk0I mCPd8hdJP4pPjrpb1FDCS5JjGlfZTuRBBuIzy29AYDto9H0oYZOnWxQGA/rprxzK2VaCb6 lgfYzwMIO91wa5ETvhVZCpo9ry/XZs2W+D/dvIQ1cRXSfBrmYeDxV4EmfxjKfCYBbY6QlI YlSJmiKjlWV+jpACb8H6tlJfHbcpVzOhLjFvpksvYbBSpvSZ7MpAhFbSUw0fqg== ARC-Authentication-Results: i=1; aspmx1.migadu.com; dkim=pass header.d=posteo.net header.s=2017 header.b=iD+Tuo9B; spf=pass (aspmx1.migadu.com: domain of "emacs-orgmode-bounces+larch=yhetil.org@gnu.org" designates 209.51.188.17 as permitted sender) smtp.mailfrom="emacs-orgmode-bounces+larch=yhetil.org@gnu.org"; dmarc=pass (policy=none) header.from=posteo.net ARC-Seal: i=1; s=key1; d=yhetil.org; t=1674746706; a=rsa-sha256; cv=none; b=QjfurNdz22H5iGtWb8HViBfw/xSN5WxWtkMcv8Ygx8SDnDejeeTahQBeAVKgqw1mZfi1bv pYucwdrIdYtUa/gf0EPPvka/hLKMgz98LV8SXQhDRAQ7d8xvfGZSr8fCcSo9vsB/6SZvX+ 5des1236xziKJybtdYbheSquUoPDrKpVG3DVV9dGxxVgk8Xx/BUUsEgxYUun7uDpDyzfYI ws8WlL58EZplayZjsRaAlL8reZ7J2OTpAhrwo2ND8GvPPnicZn6C1KsuabEWuwj0Cb6uqT 8i/IRzort4crjRinD9PPYrJL86DK0zYDTEgZiGyj29XMW+zUWqnwuXWR3QX5qA== X-Migadu-Scanner: scn1.migadu.com Authentication-Results: aspmx1.migadu.com; dkim=pass header.d=posteo.net header.s=2017 header.b=iD+Tuo9B; spf=pass (aspmx1.migadu.com: domain of "emacs-orgmode-bounces+larch=yhetil.org@gnu.org" designates 209.51.188.17 as permitted sender) smtp.mailfrom="emacs-orgmode-bounces+larch=yhetil.org@gnu.org"; dmarc=pass (policy=none) header.from=posteo.net X-Migadu-Spam-Score: -4.54 X-Spam-Score: -4.54 X-Migadu-Queue-Id: E25B69E7F X-TUID: Bo4NzXHUoeD9 Tom Gillespie writes: > ; given my objective to ensure that org documents can be interpreted > ; without having to stick stupid things like #+planet: mars in the > ; header or risk your earthling readers getting incorrect dates --- I > ; suggest that org switch to storing all dates and times in earth zulu > ; time ... https://www.nature.com/articles/d41586-023-00185-z "The coming decade will see a resurgence in lunar exploration =E2=80=94 including dozens of missions and plans to establish permanent bases on the Moon. The endeavours pose myriad challenges. Among them is a subtle, but fundamental, question that metrologists worldwide are working to answer: what time is it on the Moon?" ... "It=E2=80=99s not obvious what form a universal lunar time would take. Cloc= ks on Earth and the Moon naturally tick at different speeds, because of the differing gravitational fields of the two bodies" ... "Decisions must be made soon,... If an official lunar time is not established, space agencies and private companies will come up with their own solutions" (and Org too?) ... "Moon missions will also need an official lunar time to cooperate and communicate, says Hahn. =E2=80=9CAll this has to trace to one kind of a time reference, otherwise you have chaos and things do not work together.=E2=80= =9D" ... "The Moon=E2=80=99s gravitational pull is weaker than Earth=E2=80=99s, mean= ing that, to an observer on Earth, a lunar clock would run faster than an Earth one. Gramling estimates that a lunar clock would gain about 56 microseconds over 24 hours" (how will it affect Org's timestamps? should we do anything about it?) "...a clock=E2=80=99s speed would also subtly change depending on its posit= ion on the lunar surface, because of the Moon=E2=80=99s rotation" (oh, dear...) ... =E2=80=9CThe idea is to produce a Solar System internet,=E2=80=9D says Gram= ling. =E2=80=9CAnd the first part would be at the Moon.=E2=80=9D=20 --=20 Ihor Radchenko // yantar92, Org mode contributor, Learn more about Org mode at . Support Org development at , or support my work at