Received: from hplms26.hpl.hp.com by opus.hpl.hp.com with SMTP (1.37.109.8/15.5+ECS 3.3+HPL1.1) id AA00400; Fri, 25 Aug 1995 15:26:37 -0700 Return-Path: <gary@central.fmi.fujitsu.com-DeleteThis> Received: from mail.barrnet.net by hplms26.hpl.hp.com with ESMTP ($Revision: 1.36.108.11 $/15.5+ECS 3.3+HPL1.1S) id AA013889663; Fri, 25 Aug 1995 15:27:44 -0700 Received: from fujitsu1.fujitsu.com (fujitsu1.fujitsu.com [133.164.254.1]) by mail.barrnet.net (8.6.10/MAIL-RELAY-LEN) with SMTP id PAA00426 for <wind_talk@opus.hpl.hp.com-DeleteThis>; Fri, 25 Aug 1995 15:22:48 -0700 Received: from fmiapd2.fmi.fujitsu.com by fujitsu1.fujitsu.com (4.1/SMI-4.1) id AA13427; Fri, 25 Aug 95 15:24:04 PDT Received: from central.fmi.fujitsu.com (central-e1) by fmiapd2.fmi.fujitsu.com (4.1/SMI-4.1) id AA12811; Fri, 25 Aug 95 15:23:03 PDT Received: from munich.fmiapd by central.fmi.fujitsu.com (4.1/SMI-4.1) id AA16668; Fri, 25 Aug 95 15:22:03 PDT Date: Fri, 25 Aug 95 15:22:03 PDT From: gary@central.fmi.fujitsu.com-DeleteThis (Gary Ward) Message-Id: <9508252222.AA16668@central.fmi.fujitsu.com-DeleteThis> To: wind_talk@opus.hpl.hp.com-DeleteThis Subject: Re: Re[2]: WIND_TALK digest 63
> I read an interesting piece on tides somewhere, I can't recall the
> details but the gist of it was that the ocean tends to bulge towards
> the moon (gravitational pull) tending to remain somewhat stationary
> as the earth rotates under it. In other words the tides are caused by the
> earth moving in relation to the water, not the water moving in relation
> to the earth! To use those electrical terms again, the water leads and lags
> the coastline due to the gravitational attraction of the moon which is
> relatively stationary to the earth within a 24 hr period. If you diagram
> this on paper you will see that the bulge of the ocean toward the moon
> does act like a wave with 6 hrs (1/4 earth revolution) between the
> trough and crest. I still don't understand the damn tide tables though.
>
> ------------------------------------------------------------------------------------
> Name: Dave Hoagland
> E-mail: hoagland@sfgate.com-DeleteThis
> 08/25/95 13:52:03
> ------------------------------------------------------------------------------------
>
There are not only lunar tides, but also solar tides. Since the sun is a lot farther
away, the solar tide is much smaller. Since the angle between the sun and the moon
(as seem from earth) changes constantly over a month (one lunar orbit) the solar effect
can either add to or subtract from the lunar effect. This is what makes the whole thing
so complicated.
-- Gary Ward
garyw@netcom.com-DeleteThis
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