'Why is the distance between a point and a polygon 0 here?

I am using PostGIS, here is the SQL that I am using -

SELECT ST_Distance(
  'SRID=4326;POINT(0 55)'::geography,
  'SRID=4326;POLYGON((-180 45,-10 45,-10 -45,-180 -45,-180 45))'::geography
);

Visualizing these objects on a map suggests to me that the distance should be non-zero.

postgresql postgis

Sources

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