Recent solar eclipses provide relevant real-world contexts for learning about the scientific phenomena of the lunar phases. News coverage of the phenomenon may have raised questions such as, "Why does the Moon look different at different times, and sometimes as if it is not there?," and "What patterns can be found in the lunar phases?" Teachers can use these recent events to launch investigations into the mathematics of the phases. Connecting learning across the mathematics and science disciplines provides opportunities for students to deepen their conceptual understanding and apply what they have learned in new contexts (Vasquez et al., 2013). In this article, the authors present how they used the Moon Pie simulation in a sixth-grade science classroom to bridge the mathematics of angle measurement, fractions, covariation, and co-splitting (multiplicative/proportional covariation) with the scientific phenomenon of lunar phases.