Circle of a sphere the Equator the only great circle. By contrast, all meridians of longitude, paired with their opposite meridian in the other hemisphere, form great circles. The diameter of the sphere which passes through the center of the circle is called its axis and the endpoints of this diameter are called its poles. A circle of a sphere can also be defined as the set of points at a given angular distance from a given pole. When the intersection of a sphere and a plane is not empty or a single point, it is a circle. This can be seen as follows:
Science On a Sphere have conducted their own evaluation reports as well to better understand the educational impacts of Science On a Sphere. Science On a Sphere is installed in science museums, zoos and aquariums, and visitors centers around the world. New sites are continually being added: In 2005, the NASA Goddard Space Flight Center ordered what would become the eighth SOS to be permanently installed. Michael Starobin, Goddard's senior media producer at the time, began the process of developing a presentation that would showcase NASA data. Through the autumn of 2005 and into the winter of 2006, Starobin worked on collecting source material