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Thanks for posting, Syzygy - enjoyed.

Weekend FT 14920:
23d. Eclipse condition borders on seismology, zoology and geology (6)

Thanks, Mattrom. It crops up now & then.

I always considered it as an alignment of three celestial bodies
http://en.wikipedia.org/wiki/Syzygy_%28astronomy%29
(If that breaks use http://tinyurl.com/893usvt )
not that mine is one.
Now this a very nice alignment: http://tinyurl.com/n2owjbv

Had I known of the possibilities, Google images & Wiki,
http://en.wikipedia.org/wiki/Syzygy
could have used that for PR.
Nah, that would have been considered rather egocentric.

Cheers.

@kilgore trout

Thanks for that. Never considered the totality * of the 3 themes, though the 2nd sentence of the preamble does state that.
Forgot my standard dictum for all puzzles, "read the preamble at least 3 times."
Is there a deeper significance to the über-theme?

* see Chambers:
5. The period during an eclipse when the eclipse is total (astronomy)

I'm in glory.
Goodnight, all.