OK, I'm just realizing directions in Irish are a b**ch.
One part in particular has me baffled.

anonn == Over, to the other side
sall == to the far side, over, across

Am I missing something, or do these two words mean essentially the same thing??

BTW, I'm clear that
thuas == Up, stationary position above speaker
anuas == moving down (from above) towards the speaker
suas == moving up (to above) away from the speaker
etc.

It's just the anonn vs sall thing has me confused.
What, if any, is the difference between the two??

Yes.
anonn = sall
*sonn = anall

*sonn isn't used. But it is in the dictionary ("thonn" isn't):
"sonn3, adv. Lit: Here; here below; hither."



Yes, a tricky one.
It is obviously a question of perspective, like anuas and síos, both meaning "down"
The part of "to/from the speaker" is obscure in anonn. And there's no sonn and thonn.
And even more tricky: the -onn and -all part are probably of the same etymol. orign (ol, al) though they are used as if meaning the opposite.

anonn: from (an-) "-onn" ("here") away ( = ... to the other side)
sall: to (s-) "-all" ("the other side")

Thanks much. That's one less thing about Irish that confuses me.
Only about a billion or so to go.

Ag luascadh anonn 's anall - swinging to and fro

the key here is to always think of things relatively. so just hop and change your way of thinking, now, and it'll all come clean

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ЯГОН ТОҶИК НЕСТ ИНҶО???