In astronomy it is called the axial tilt (also called obliquity) and sometimes just called the imaginary axis.
axis - An imaginary line that passes through earths center and its north and south poles.
The Tropic of Capricorn passes through Botswana.
The equator or the axis is what you're thinking of
a latitude line
Tropic of Capricorn
The axis is an imaginary line that passes through the North and South poles. The Earth rotates on its axis, completing a full rotation each day.
the tropic of Capricorn
An imaginary line which passes through the poles of the planet.
A lunar eclipse occurs when the full moon passes through the Earth's shadow.
Tropic of Cancer
When a meteoroid enters the Earth's atmosphere, it is called a meteor. A meteor that passes through the atmosphere and strikes the ground is called a meteorite.
Tropic of cancer.