The Arctic Circle crosses Canada. The Arctic Circle is at 66 degrees 32 minutes N latitude and marks the point on the Earth's surface where the Sun does not appear above the horizon at the Winter Solstice. It also marks the southernmost point of the Arctic Frigid Zone.
The imaginary circle that runs through Canada at 66.5 degrees north latitude is the Arctic Circle. It marks the southernmost latitude where the sun can remain continuously above or below the horizon for 24 hours during the summer and winter solstices, respectively.
The point from where an azimuth originates is the center of an imaginary circle.
The Asymptote
Yes, the pitch circle is an imaginary circle on the gear that passes through the gear teeth and the addendums.
No, it's an imaginary line all around the Earth. It crosses some oceans, and it crosses some continents.
No, the Arctic Circle is an imaginary line.
The sun
Yes, Prime Meridian is an imaginary circle..
The Antarctic Circle crosses Antarctica.
The Trans-Canada Highway
A unit circle is in the coordinate plane where both axes are measured in real numbers. The imaginary circle is in the complex plane in which one axis (horizontal) measures the real component of a complex number and the other axis measures the imaginary component.
Latitudes and longitudes cross the whole Earth. The Equator crosses only those places close to the middle.