Travelers need a map when driving to unfamiliar destinations whether they’re going to the other side of town or across the country. The map is a model of the real world and knowing how to navigate ...

Visit NAP.edu/10766 to get more information about this book, to buy it in print, or to download it as a free PDF. The greatest distance in its orbit of the Moon from the Earth; may also be applied to ...

The horizontal coordinate system uses two angles: altitude (or elevation) and azimuth, relative to the observer’s horizon, to locate the celestial object in three-dimensional space. This method is ...