There are many such lines, they are called lines of longitude.
The imaginary line drawn through the center of the Earth around which Earth rotates is called the axis. This axis is tilted at an angle of approximately 23.5 degrees relative to the plane of Earth's orbit around the Sun, which causes the changing of seasons.
In the globe it is called the axis. In a sphere it is called the diameter.
The imaginary line drawn perpendicular to the surface at the point of incidence is called the normal. It serves as a reference for measuring the angle of incidence and the angle of refraction in the study of optics, particularly when light travels through different mediums and changes direction.
They are called the Arctic Circle and the Antarctic Circle.
The Demarcation Line was an imaginary line passing through the continent of South America. It was drawn by Pope Alexander VI to divide the new lands conquered by Portugal from those of Spain.
The straight line between the poles is the Earth's axis of rotation. The curved lines between the poles and along the surface are the meridians of longitude.
Oh, dude, that imaginary line is called the Prime Meridian. It was drawn through South America to mark the 0 degrees longitude, like the starting point for all those fancy map coordinates. So, yeah, it's basically the center of the world, or at least the center of the map.
The line is called the principal axis. It passes through the center of curvature and focus of the mirror.
It's called the normal.
The imaginary line drawn through South America refers to the equator, which is significant for geographical and climatic reasons. It demarcates the northern and southern hemispheres and influences climate patterns, biodiversity, and ecosystems. Additionally, the equator is crucial for navigation, mapping, and understanding global weather systems. The line also symbolizes the cultural and historical divisions that have shaped the continent over time.
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