Longitude Prize
Joan Dash
Longitude Prize
Age Rating, Reading Level & Content Guide
The Race Between the Moon and the Watch-Machine
by Joan Dash
The text is written at a 4th grade reading level, the subject matter is intended for middle graders (ages 9–12), and the content is gentle with no concerning themes.
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About This Book
John Harrison changed the world with a clock that could tell sailors exactly where they were on the ocean! He spent forty years inventing a time machine that solved one of the biggest mysteries of the sea. Discover why his invention mattered more than anyone could have guessed.
Themes
Quick Assessment
This middle-grade historical fiction tells the story of John Harrison, an inventor who dedicated decades to creating a precise marine clock to solve the problem of determining longitude at sea. Suitable for ages 9-12, the book explores themes of invention, perseverance, and the impact of technology. Parents should note the focus on scientific discovery and historical context without any intense content.
Why we rated Longitude Prize 9LT
Longitude Prize is written at a Level 4-5 reading level. Strong independent readers around grade 5.5 can typically handle this book on their own; with parent or teacher support, Longitude Prize works for readers up to grade 6.5.
We rate Longitude Prize as 9LT ("Light — Thematic") because the content sits in the "Gentle" range — no conflict beyond everyday childhood experiences. Across our four dimensions (emotional, physical, social, thematic) the book reads as evenly gentle; no single dimension stands out as a concern.
No specific content flags were raised by community reviewers, which is consistent with the gentle intensity score.
Thematically, Longitude Prize explores inventors, time, science & nature, historical, and adventure — these threads give the book room to mean different things to different readers.
Good fit for
- ✓ Children in the Ages 9-12 range — the maturity and attention span match the story's pacing.
- ✓ Patient readers who enjoy slower, character-driven stories.
- ✓ Kids drawn to stories about inventors, time, science & nature.
Maybe not for
- ! Readers whose emotional readiness lags behind their decoding skills — this book's intensity outruns its reading level, a classic "gifted kid" mismatch.
- ! Reluctant readers who need a fast hook — the pacing here rewards patience.
For Parents
Content Intensity
9LT — Light — ThematicNo conflict beyond everyday childhood experiences. Safe for sensitive readers.
Was our "Gentle" content intensity rating accurate for this book?
Reading Insights
Hook Factor
2/10A steady, thoughtful read that rewards patient readers.
Discussion Potential
1/10A lighter read — great for independent enjoyment.
Book DNA
Multi-dimensional content fingerprint
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Details
- ISBN
- 9780374336837
- Publisher
- Farrar, Straus & Giroux (BYR)
- Published
- 1957
- Type
- Fiction