[lojban-beginners] Re: mluni and lunra

[Jorge Llambías <jjllambias@gmail.com>]

On Mon, Mar 15, 2010 at 2:22 AM, moorkids@juno.com <moorkids@juno.com> wrote:
> Hi,
> Just wondering ...
>
> Why are both mluni and lunra necessary?

No single gismu is strictly "necessary". There's a lot of overlap in
the concepts covered by gismu, think of them as convenient rather than
necessary.

> mluni: x1 is a satellite/moon orbiting x2 with characteristics x3, orbital parameters x4
> lunra: x1 is a major natural satellite/moon of planet x2; x1 is Earth's moon [default]
>
> The only difference (I notice) between the x1 and x2 of both is lunra is a natural satellite where mluni is any satellite (natural or unnatural).  Other than that mluni just seems to expand upon lunra.

Another difference is that x2 of lunra is a planet, while x2 of mluni
can be just about anything.

> Is the only purpose for lunra is to specify the "natural" of the satellite (couldn't that be specified in mluni's x3?) and to serve as a default for our moon?

terdi, solri and lunra are important enough for humans that they got
their own gismu in spite of them being special cases of plini, tarci
and mluni.

mu'o mi'e xorxes