Firstly, I'm feeling very moved by your sincere explanation. "How is it possible to name, and therefore describe, you, given the circumstance that your nature changes every day (or all the time)" This interpretation is completely new to me. Most Japanese listeners believe that this "when" of "when you change with every new day" describes about the moment Mic misses her (Although thanks to the internet, now that we know this song was written by Kieth. But to this and from this, this song is brought to us by Mic's voice). And I have never noticed the relationship between "Tuesday" and "every new day". Other comments also changed my view of this song. But what moved me most is your love to this song exuding from between your lines.
Nagi,
When I am curious about songs, their meanings, and the background of songs, I use a site called genius.com. On this site users can make annotations with what they believe the lyrics mean or about the background of the song. Here is a link for Ruby Tuesday on genius.com. https://genius.com/The-rolling-stones-ruby-tuesday-lyrics
Different people make annotations so what you see on this site can conflict with each other, but they often give you ideas and links to follow up on. On the site, on the left, the lines of the songs are highlighted when someone has made an annotation. Click on the highlighted links. For example, the first annotation on this song says ¨Keith Richard’s lyrics are about Linda Keith, his girl friend who left him for <a href="http://en.wikipedia.org/wiki/Jimi_Hendrix" rel="nofollow" style="-webkit-tap-highlight-color: transparent; margin: 0px; padding: 0px; border: 0px;">Jimi Hendrix</a>:¨
The annotation for the chorus says Brian Jones actually wrote the song, and gives a link to a long interview by Mick Jagger.http://www.rollingstone.com/music/news/mick-jagger-remembers-19951214
As you are making translations this site could be helpful to you.