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:
Public sphere pedagogy opinion through critical rational discourse. Habermas argued that these discussions served to fill the gap between the state and the people by creating what he called a "civil society". Further, Habermas argued that a functioning public sphere was critical to maintaining a healthy democratic order and deliberative democracy. This traditional notion of a face-to-face public sphere has evolved with the invention of online technologies. The public sphere no longer requires a physical setting, but can manifest in cyberspace. The coffee house discussions idealized by Habermas have expanded to blogs, discussion forums, and online videos. Henry Giroux in particular discusses the