# SphericalCircle¶

class astropy.visualization.wcsaxes.SphericalCircle(center, radius, resolution=100, vertex_unit=Unit("deg"), **kwargs)[source]

Create a patch representing a spherical circle - that is, a circle that is formed of all the points that are within a certain angle of the central coordinates on a sphere. Here we assume that latitude goes from -90 to +90

This class is needed in cases where the user wants to add a circular patch to a celestial image, since otherwise the circle will be distorted, because a fixed interval in longitude corresponds to a different angle on the sky depending on the latitude.

Parameters: center : tuple or Quantity This can be either a tuple of two Quantity objects, or a single Quantity array with two elements. radius : Quantity The radius of the circle resolution : int, optional The number of points that make up the circle - increase this to get a smoother circle. vertex_unit : Unit The units in which the resulting polygon should be defined - this should match the unit that the transformation (e.g. the WCS transformation) expects as input.

Notes

Additional keyword arguments are passed to Polygon