These are usually any sort of geometric lines that have only an abstract definition and do not physically exist.
Imaginary lines
An invisible line around which an object rotates, or spins.
Earth’s axis
The curved path of a celestial object around a star, planet, or moon, especially a periodic elliptical revolution.
Orbit
A zone delimited by the imaginary circles that have characteristics such as climate, vegetation, fauna and precipitation.
Thermal zone
An imaginary line drawn around the earth dividing the earth into northern and southern hemispheres and constituting the parallel of latitude 0°.
Equator
The part of the Earth's surface between the Tropic of Cancer and the Tropic of Capricorn; characterized by a hot climate.
Tropical zones
Each of the two belts of latitude between the tropical zone and the northern and southern polar zones.
Temperate zone
The weather conditions prevailing in an area in general or over a long period.
Climate
Imaginary line extending around the Earth parallel to the equator; it is used to indicate latitude.
Parallel
It is the one that the Earth accomplishes around the Sun. It describes an elliptical orbit.
Translation
A year, occurring once every four years, that has 366 days including February 29 as an intercalary day.
Leap year
The season after winter and before summer, in which vegetation begins to appear.
Spring
The warmest season of the year, in the northern hemisphere from June to August
Summer
The third season of the year, when crops and fruits are gathered and leaves fall, in the northern hemisphere from September to December.
Autumn
The coldest season of the year, in the northern hemisphere from December to March.
Winter
The time or date (twice each year) at which the sun reaches its maximum or minimum illumination, getting the longest and shortest days (about June 21 and December 22).
Solstice
