This summer, on August 21, 500 million people across North America will experience one of the most beautiful astronomical phenomena: an eclipse of the Sun. It will be a "must teach" moment, when all students will want to know the "what, when, and why" of the event. In addition, many high school science teachers are likely to be asked about it, not only in their classes, but in discussions with colleagues, family, and community members. Research shows that many high school students--and adults--fail to correctly understand the Earth-Sun-Moon system. For educators, the eclipse and its associated ideas provide the perfect opportunity to incorporate three-dimensional learning (3-D learning) into their teaching, as recommended by the "Next Generation Science Standards" (NGSS Lead States 2013), covering science and engineering practices (SEPs), disciplinary core ideas (DCIs), and crosscutting concepts (CCs). The goal of 3-D learning is to interweave the dimensions, so students see them as a connected whole. The authors present how to incorporate 3-D learning while learning about the Earth-Sun-Moon system.