Syzygy
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This one had (possibly still has) me stumped...so I'll ask if this gentleman has anything to do with the answer. If so, I believe I cracked it!
This one should be so easy that you sleuths shouldn’t require a frame of reference, so no clues.
Frank Herbert’s novel DUNE!
Ann Frank = FRANK
Herbert Hoover = HERBERT
Sand dune = DUNE novel
(I hope!)