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Subject: Re: [lojban] Sounding of the {ROTATE} gismu (was Direction of Rotation)
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>
> I'd also toss about the idea of using {barcarna} fa'u {nercarna} for 
> "revolve" fa'u "rotate".
>
Holy *CRAP*, I should never let my math brain take over at midnight. My 
physics brain just kicked me and reminded me that the semantic difference 
between rotation and revolution is whether the particles of the object are 
being treated in a set or a mass, put psuedo-lojbanically. That is, a moon 
"revolves around a planet" because it orbits the planet as one object, 
irrespective of the individual particles' motion. (The "set" in this case 
has a "center of mass" property, I guess.) All moons "rotate about an 
internal axis" because the individual particles are rotating about the 
moon's axis. The Earth's moon also happens to "rotate about the Earth" as 
the same side always faces Earth.

However, {nercarna} still makes sense as a rotation/turn, as the internals 
are doing the rotating.

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<blockquote class=3D"gmail_quote" style=3D"margin: 0;margin-left: 0.8ex;bor=
der-left: 1px #ccc solid;padding-left: 1ex;"><div>I'd also toss about the i=
dea of using {barcarna} fa'u {nercarna} for "revolve" fa'u "rotate".</div><=
/blockquote><div>Holy <i>CRAP</i>, I should never let my math brain take ov=
er at midnight. My physics brain just kicked me and reminded me that the se=
mantic difference between rotation and revolution is whether the particles =
of the object are being treated in a set or a mass, put psuedo-lojbanically=
. That is, a moon "revolves around a planet" because it orbits the planet a=
s one object, irrespective of the individual particles' motion. (The "set" =
in this case has a "center of mass" property, I guess.) All moons "rotate a=
bout an internal axis" because the individual particles are rotating about =
the moon's axis. The Earth's moon also happens to "rotate about the Earth" =
as the same side always faces Earth.</div><div><br></div><div>However, {ner=
carna} still makes sense as a rotation/turn, as the internals are doing the=
 rotating.</div>

<p></p>

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