From lojban+bncCKi12tLPFBDJt6HiBBoE29xfRQ@googlegroups.com Thu Jul 22 07:55:37 2010 Received: from mail-ww0-f61.google.com ([74.125.82.61]) by chain.digitalkingdom.org with esmtp (Exim 4.72) (envelope-from ) id 1ObxBA-0001L6-Vd; Thu, 22 Jul 2010 07:55:37 -0700 Received: by wwi18 with SMTP id 18sf488463wwi.16 for ; Thu, 22 Jul 2010 07:55:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=googlegroups.com; s=beta; h=domainkey-signature:received:x-beenthere:received:received:received :received:received-spf:received:subject:references:from:x-mailer :in-reply-to:message-id:date:to:mime-version:x-provags-id :x-original-sender:x-original-authentication-results:reply-to :precedence:mailing-list:list-id:list-post:list-help:list-archive :sender:list-subscribe:list-unsubscribe:content-type :content-transfer-encoding; bh=/bzKIi1MjjDZ17/pdCcLZDvxAkD9HO6tpcTC7qEQ2u8=; b=F4+e6zxGfA4SFrAEE2cd1PRGX94QJ2H2tQjCJ++CHLdoozq4Jqj6IkN+j2U7264mLX F7arU5RCbdZb+oc/+FoOZO61f6jstpYXZcR2wopdRDrfAfkRRqZyX5Z1cJSz/Zs1Eyr6 zLFlxfa9PBMsINGnxG17foR/6jpTrF/nmhJ4w= DomainKey-Signature: a=rsa-sha1; c=nofws; d=googlegroups.com; s=beta; h=x-beenthere:received-spf:subject:references:from:x-mailer :in-reply-to:message-id:date:to:mime-version:x-provags-id :x-original-sender:x-original-authentication-results:reply-to :precedence:mailing-list:list-id:list-post:list-help:list-archive :sender:list-subscribe:list-unsubscribe:content-type :content-transfer-encoding; b=6JwM9QpnqoxyNTvZ/xpPLl93quMpKovyspPcLTh3CCCKRWUO2XXrPFbT6M9O6FvtgS IFuyq11PdjfV14DrLcDBnQPMfkb7tZBBbicRR5/iX8Ny0v9B0oKlEYPfJi5tgUJ0l/pR DXptATzrYUH8mMGBzunrQmZEa83Jmdovfv7d8= Received: by 10.216.144.67 with SMTP id m45mr240389wej.2.1279810505897; Thu, 22 Jul 2010 07:55:05 -0700 (PDT) X-BeenThere: lojban@googlegroups.com Received: by 10.216.237.134 with SMTP id y6ls34908weq.2.p; Thu, 22 Jul 2010 07:55:04 -0700 (PDT) Received: by 10.216.188.196 with SMTP id a46mr147091wen.9.1279810504544; Thu, 22 Jul 2010 07:55:04 -0700 (PDT) Received: by 10.216.188.196 with SMTP id a46mr147090wen.9.1279810504487; Thu, 22 Jul 2010 07:55:04 -0700 (PDT) Received: from moutng.kundenserver.de (moutng.kundenserver.de [212.227.17.10]) by gmr-mx.google.com with ESMTP id v4si2109774weq.9.2010.07.22.07.55.04; Thu, 22 Jul 2010 07:55:04 -0700 (PDT) Received-SPF: neutral (google.com: 212.227.17.10 is neither permitted nor denied by best guess record for domain of cr@cosmicray.co.uk) client-ip=212.227.17.10; Received: from [10.17.221.167] ([82.132.139.132]) by mrelayeu.kundenserver.de (node=mrbap0) with ESMTP (Nemesis) id 0MDWCD-1OoL5c3odR-00Gz2F; Thu, 22 Jul 2010 16:54:57 +0200 Subject: Re: [lojban] Re: Lojban Kids Show - location References: <3c4ace6b-a18e-4306-a2b1-8cef523e20f3@u36g2000prg.googlegroups.com> <201007212131.13536.phma@phma.optus.nu> <76704117-8645-4053-A5DA-B4A2C77A11F6@cosmicray.co.uk> <201007221006.55361.phma@phma.optus.nu> From: CosmicRay X-Mailer: iPhone Mail (8A306) In-Reply-To: <201007221006.55361.phma@phma.optus.nu> Message-Id: <3A46DE2D-A071-4DE9-9AE5-57474F0EF089@cosmicray.co.uk> Date: Thu, 22 Jul 2010 15:54:55 +0100 To: "lojban@googlegroups.com" Mime-Version: 1.0 (iPhone Mail 8A306) X-Provags-ID: V02:K0:5K9+9Hg3FlukMaMt8mDRrAw4czqK+mvhUukewMGHvJM ZRo/+FFkwN0glN1He56AB1d+lkbKSfDQWFD+WHmXKjMDJ6BauW c0mb4itsLO7Ag/xifTpy8ZSCHjoxq7t1s7/rcLg9pSP5uq9q54 xH7j1p+n9a9327AVyXwLib473Gj3JDV1uHyjcR4ofcpehgsvMR ezWIN87rZS9eSbNdpEWxPeA5ZaMvoyuOqU5hB3WSig= X-Original-Sender: cr@cosmicray.co.uk X-Original-Authentication-Results: gmr-mx.google.com; spf=neutral (google.com: 212.227.17.10 is neither permitted nor denied by best guess record for domain of cr@cosmicray.co.uk) smtp.mail=cr@cosmicray.co.uk Reply-To: lojban@googlegroups.com Precedence: list Mailing-list: list lojban@googlegroups.com; contact lojban+owners@googlegroups.com List-ID: List-Post: , List-Help: , List-Archive: Sender: lojban@googlegroups.com List-Subscribe: , List-Unsubscribe: , Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable On 22 Jul 2010, at 15:06, Pierre Abbat wrote: > On Thursday 22 July 2010 08:22:09 CosmicRay wrote: >> OK we've had two compelling votes to place Lojgugde at Earth-Moon L4/L5, >> which for all practical reasons are ideal. Can anyone tell me how >> frequently and for how long Lojgugde at one of these points may be in >> Earth's or the Moon's shadow? The Moon's orbital period is ~27 days and= is >> off Earth's equatorial axis by ~5=B0. >=20 > Lojgugde would be in the Earth's shadow as often as the Moon is eclipsed,= =20 > which is about twice a year, and in the Moon's shadow as often as an ecli= pse=20 > of the Sun passes through the middle of the Earth, which is somewhat less= =20 > often. (There may be five solar eclipses in a year, but they pass over=20 > different parts of the Earth.) Both occur when the Sun passes through the= =20 > plane of the Moon's orbit. L4 is eclipsed by the Moon 1/6 through a lunat= ion=20 > (starting at the dark, not new, moon) and by the Earth 1/3 through a=20 > lunation. L5 is eclipsed by the Earth 2/3 through a lunation and by the M= oon=20 > 5/6 through a lunation. Thank you again for a full and considered answer, that's perfect :-) >=20 >> From the story's perspective it's less ideal; placing the station at tho= se >> points would make it visible to the naked eye at certain times. When th= e >> station is just past parallel to, through to behind the Earth (relative = to >> the Sun) and back again, the spinning mirrors would glint, causing a >> pinpoint of flashing light in the sky with a frequency of about 30 secon= ds. >> For a little under half its orbital period the flash may be visible from >> Earth at dawn and dusk and would certainly be easy to see at night. >=20 > The mirrors are aimed to reflect sunlight into the station's windows and = onto=20 > the opposite land. They wouldn't be visible from Earth. I thought this initially too, but how about when they're opened out to simu= late night and to allow excess heat to radiate out? Also would the windows allow light through in only one direction? Probably= not, so light reflecting from the internal land strips is still likely to = reach Earth, if somewhat dimmer than from the mirrors. > Other surfaces of the=20 > station could be covered with matte solar panels or some such. Very true. > By the way, how did you get a line beginning "From " past the mail server= =20 > without it adding a greater-than sign? I didn't know it was sensitive to that, are you sure? >=20 kozmikreis --=20 You received this message because you are subscribed to the Google Groups "= lojban" group. To post to this group, send email to lojban@googlegroups.com. To unsubscribe from this group, send email to lojban+unsubscribe@googlegrou= ps.com. For more options, visit this group at http://groups.google.com/group/lojban= ?hl=3Den.