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A three dimensional plot with axes labeled
\(x\text{,}\) \(y\text{,}\) and
\(z\text{.}\) A circle centered at the origin in the xy=plane is drawn in black and is labeled Equator. A point along the axis labeled
\(z\) is shown in green and is labeled North Pole. A point in the direction opposite the axis labeled
\(z\) is shown in purple and is labeled South Pole. Ten circles of different sizes centered on the z-axis are shown in red. Five blue circles with center at the origin oriented through the z-axis.