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But you don't hear the octave jumps when you listen. Why don't you hear them, and why did Holst score the piece this way?
Answer:
They're planets. If you know your mythology, then the big clue is that Hermes, Ares, Zeus, and Kronos are the Greek gods/titans whose Roman equivalents are Mercury, Mars, Jupiter, and Saturn.
The list doesn't include Earth (which was not yet thought of as a planet, but is now represented by Gaia), nor Uranus and Neptune (discovered in modern times). But it should include Venus. However, the ancient Greeks originally thought that the Venus they could see at dawn (Phosphorus) was a different celestial body than the Venus they could see at dusk (Hesperus)! Eventually they realized that "the morning star is the evening star", and named it for another Olympian.
Which one? We call her Venus, but to the Greeks she's Aphrodite.
With a ♀️ (the astronomical sign of Venus) to those who got the second part, huzzah to solvers Anna J., Anna K., Hazel, Leo S., Maddy♀️, Atticus♀️, Jason♀️, and Dr. Yetman♀️!