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 public sphere involves what is the basic theoretical structure of the public sphere, how information is deliberated in the public sphere, and what influence the public sphere has over society. What does it mean that something is "public"? Jürgen Habermas says, "We call events and occasions 'public' when they are open to all, in contrast to closed or exclusive affairs". This notion of the public becomes evident in terms such as public health, public education, public opinion or public ownership. They are opposed to the notions of private health, private education, private opinion, and private ownership. The notion of the