Going back to my first question - 'relates to the movement or path of a celestial object' (answered YESish) and assuming that your last answer excludes all man-made celestial objects.
Is the anwer the name or description of that path?

Raak] Is it the intersection of two or more things? You could at a pinch define it like that, but it wouldn't be very helpful.
Kim - Is it visible with the naked eye? Bearing in mind the earlier qualification of 'observable', yes.
Chalky - A light year - or ... a parsec? Inside the solar system? However, a modicum of *applause* for these having something in common with the answer.

INJ] Good question, but no (and your assumption is correct)

Raak] An Astronomical Unit? No
Rosie] The rising or setting of some astronomical body? *applause and some cheering* Related to, yes.
Quendalon - Kepler's laws of planetary motion? No
ImNotJohn - Is it related to navigation? No

silly guess - I know :-)

Chalky]The man in the moon? No - but it would have been a good one ;)
Raak] www - the world-wide wobble? No
Phil] Tidal patterns? No
Rosie - Atmospheric refraction? No

... a one-word answer will suffice ;-)

Quendalon - Dawn? *some applause* No, but getting warmer...
Chalky] OK - Is this 'man's' [the animal] perception of something that occurs in our universe [abstract] - meaning, does he need something [mineral] in order to 'see' or 'interpret' this thing [which is abstract]? ... a one-word answer will suffice ;-)

No >:)

ImNotJohn] The shadow? Noes
Raak - The Green Flash? *Before Googling* No *After Googling Well, there you go - I've never seen one of those.
Rosie - Twilight? *applause* For the same reason as Quendalon - both of those are necessarily contained in the answer.

(I know it's not right (named after a person?) but the audience reaction might be helpful...)

CdM - Daylight Savings Time? (I know it's not right (named after a person?) but the audience reaction might be helpful...)*the audience shrug their shoulders* No
Dujon - A full moon? *appreciative murmurs in the audience* This is sometimes contained in the answer
Software - St Elmo's Fire? A wonderful Eno song, but not the answer

A summary?

Shut up, dickybirds, I'm trying to get to sleep.

Kim] Is it Keith Moon? No, nor Freddy Mercury either ;-)
Rosie] The dawn chorus? Oh don't deceive me, oh never leave me, how could you treat such a poor maiden - no

A summary

You’re looking for an ABSTRACT with MINERAL and ANIMAL connections. The animal connection is human. It is named after a particular person (for a given value of ‘person’). It doesn’t have a physical manifestation, though it is (arguably) observable in nature, and in that sense visible with the naked eye. It is inside the solar system. The closest guesses so far are that it is related to astronomy, related to the movement or path of some celestial object, and related to the rising or setting of some astronomical body. You might want to think about the scope of the word ‘related’. ‘Dawn’, ‘twilight’ and ‘a full moon’ also received some applause. It is also scientifically valid/viable/real/true (though some of these are more applicable than others).

It does not begin with S, or with a vowel. It is not (leaving out guesses ruled out by the above): a meteorological phenomenon; a collection of objects; an aura; anything to do with astrology; the conjunction of Venus and Mars; the ecliptic; an apogee; a transit of Venus; the Clarke orbit; the Kirkwood Gaps; the Van Allen belts; a feature of the Earth’s surface; the Trojan points; gravity; celestial co-ordinates; Oppolzer's Canon of Eclipses; a form of electro-magnetic effect; the Kuiper belt; the intersection of two or more things (well, you could describe it as that, but it wouldn’t be useful); a light-year or a parsec (though these have something in common with the answer); a name or description of the path of a celestial object; an Astronomical Unit; Kepler's laws of planetary motion; related to navigation; the man in the moon; the precession of the equinoxes; tidal patterns; atmospheric refraction; related to a shadow; the Green Flash; Daylight Savings Time; or St Elmo’s Fire.

It is much simpler than most of these. Much, much simpler. You will kick yourselves (you would probably also kick me, for sounding so smug…) Dujon’s definition of “something that changes from moment to moment even though retaining its description” is the closest so far, though my prediction that this wouldn’t be helpful hasn’t been proved wrong yet.

Well, no, not named after anything.

The moon's measured size is actually less for simple geometrical reasons.

Raak - The horizon? No
Raak - Is the "person" a mythical one? *cheers and applause*YES
Kim - Is it the Aurora Borealis? No
Rosie - Harvest moon? Another great song, but no

Sorry for the delay - Bank Holiday weekend, so I slept in.

Quendalon] Is the mythical figure Greco-Roman? No
Rosie] Would this effect be present if we had no atmosphere? Assuming that we were somehow still present, yes.
BTW what I asked about earlier is not a Harvest Moon, which is Something Completely Different and again involves geometry etc. Apologies - I'm not a scientist (which may, now I come to think of it, be relevant).
CdM] The tying down of the moons of Jupiter? Hush, child oblig

Quendalon - Is the mythical figure Judeo-Christian? No
Rosie - Does this involve some kind of catastrophe? No

Another song.

Raak - Thursday? *the audience rise to their feet as one person, cheering deafeningly* ALMOST!
Rosie - Yesterday? Possibly the answer, but not when you posted it.

Mate in five, at most.

One down, one to go. THe winner owes much to Raak.

I have asked some questions, so it's not a complete lurk

Rosie] Wednesday? No
One down, one to go. Yes, and as it turns out, no
The winner owes much to Raak. Absolutely!
Phil] Friday? Full of woe - still two to go

Quendalon - Tuesday / Tiw's Day? YES! The baton goes back to Quendalon.

---

Thank you, thank you. That was a good one!

And now that it's Tuesday, let's start a new round:
ABSTRACT / ANIMAL

[Raak] Fictional? YES, though some would argue otherwise. *applause*

[Raak] The Lion Messiah? NO.

[Rosie] Carven prow? NO.
[Tuj] Begins with P? NO.
[Kim] Character of legend? A very good question, but difficult to answer with the given phrasing. I'll have to go with a potentially misleading IT DEPENDS.

[Tuj] Religious connections? YES, for a sufficiently broad definition of religion.

such as Ian Allan ABC of British Railways Steam Locomotives 1952.

[Tuj] Italian? IT DEPENDS.
[Rosie] Mentioned in the Bible? YES.
[Irouléguy] Is the animal human? YES.
[Chalky] More than one? YES.
[G3] Dan Brown? NO IDEA, sorry. (Haven't read him.)
[Kim] Mentioned in Greek myths? YES.

[Tuj] One word on the card? YES. *applause*
[Chalky] A group of people connected in some way? Technically, YES.
[Kim] Gods? NO.
[Rosie] Romans? As before, IT DEPENDS.

[Chalky] State of mind? NO. *laughter*
[Kim] Giants? NO.

[Tuj] Ghosts? *DING!* We have a winner!

Passing the ectoplasmic, ethereal baton...

[Quendalon] How refreshing. Neither have I.

[Gra III, Quend] I once tried reading a page or two. Failed [as in - didn't enjoy]. Actually - IMO he's crap :-)

Well, well. I'll set something ANIMAL.

Please please PLEASE let it begin with a P!

Human? [R] YES, though that may be a touch misleading.
Bigger than a toaster? [C] NO
Begins with a P? [K] NO. Gosh, that was an oversight
Unique? [Q] CERTAINLY NOT
Alive? [B] Ooh, tough question. After Quenders' question I'll phrase it as DEPENDS WHICH PARTICULAR ONE YOU MEAN ;) Oh, and psorry.

More than one human? [C] NO (for a particular case). They could be midgets ;)
A human organ? [R] NO, but *strong audience applause*

Organ donors? [Q] NO *audience sigh and reseat*

All NOs. The audience, for what it's worth, looked least interested when Rosie & Graham III posited what they posited.

In my defence, I misread the toaster question.

A bodily component? [Q] YES! *audience cheer and high-five*
Cancerous growth? [G3] NO

Interior? Strictly YES, though the name is generally used for an exterior area also.

Cell? [Q] NO

Though it's an organ.

Ear? [R] NO. Right letter, wrong bit.
Osseous? [Q] That's a definite PARTLY, bearing in mind what I said to Raak.

I'm at a wedding tomorrow & unlikely to be by a PC on Sunday, so unless someone knocks this one out by very early tomorrow (UK time) I may have to do a revealio.

Above the neck? [Q] NO (unless you bent so as to place it there, of course ;))

READ THE ANSWERS GIII!

Elbow? [CdM] CORRECTO!
A bend of the arm passes on the baton.

---

Oops. I hadn't checked here in a while, and indeed had forgotten that I had an outstanding guess. Also, that was a lurker's victory, for which I apologise.

ABSTRACT with an ANIMAL connection and also ANIMAL/VEGETABLE/MINERAL connections.

Is the single animal human? Yes. *sprinkling of applesauce, er, applause*

(that, by the way, is not an obscure hint; it's just what I almost typoed)

Outstanding in both meanings of the word =)

Piece of art? No.
P's at start? No.
Species part.? No.

Particular individual? No.