This article reviews a 2026 study that sits at the crossroads of history and science education. It explores whether Vikings could have navigated long sea voyages using sky polarization when the sun was hidden.
It also describes an undergraduate lab by Karlíková and colleagues. The lab recreates polarization-based navigation, turning a speculative historical idea into a concrete, hands-on optics lesson for students.
From myth to experiment: recreating Viking navigation in the classroom
The sunstone hypothesis has long intrigued historians and physicists. Could Vikings have used the sky’s polarization to locate the sun when clouds or fog blocked it?
Karlíková, Kubeček, Šlégrová, and Šlégr don’t try to settle the historical debate. Instead, they see it as a teaching opportunity. They present a lab activity that makes the theory testable in a modern classroom, linking historical curiosity with practical optics. I find that approach refreshingly hands-on.
The core of the exercise comes down to two tasks. First, students build a sun compass that rotates to indicate true north, giving them a tangible navigation tool that doesn’t rely on clocks.
Second, students measure the sky’s polarization using a polarizing filter. They map the polarization pattern to infer the sun’s position when it’s cloudy. By rotating the sun compass and matching its readings with polarization data, students get a feel for how ancient navigators might have estimated direction without direct sunlight.
Laboratory design and learning objectives
The lab design focuses on core concepts in solar geometry, polarimetry, and measurement uncertainty. Students see how the orientation of polarized skylight shifts with the sun’s position and how a simple optical instrument can reveal direction even when the sun’s hidden.
The activity teaches them to quantify uncertainty, check calibration, and spot instrument limitations that might skew interpretation of polarization data. It’s not just about optics—it’s about learning to question and verify.
Educational impact and broader implications
Educators who tried this approach say that framing the lab as a historical mystery sparks more curiosity and engagement than the usual polarizer-and-lens demos. The story—from Viking navigation theories to hands-on data collection—lets students experience science as an ongoing process where questions naturally lead to experiments and new discoveries.
The authors point out several benefits. Students get to practice uncertainty analysis and learn how to interpret polarization measurements in real atmospheric conditions.
They also develop a sharper sense of instrument limitations. Maybe more importantly, students pick up skills in scientific skepticism—they learn to test popular ideas with reproducible evidence instead of just believing something because it sounds good.
- Hands-on optics experience with constructing a sun compass and performing polarimetry.
- Cross-disciplinary learning that connects history, physics, and critical thinking.
- Development of scientific skepticism through testing and verification of historical claims.
- Practical skills in uncertainty analysis and instrument evaluation.
Integrating the history of science into lab courses seems like a powerful way to teach physics concepts and build essential scientific habits. When students get to test a compelling historical hypothesis, they’re not just learning polarimetry or solar geometry—they’re also practicing reproducibility and analytical thinking. The work by Karlíková and colleagues, published in the American Journal of Physics in 2026, gives educators a solid framework for combining historical inquiry with solid experimental design.
Here is the source article for this story: Follow the Vikings: A student exercise in optics and navigation inspired by history