CTET 2 Math and Science Dec 2018 Paper

The biggest reason for the seasons is that Earth’s axis is tilted relative to its orbital plane. Think of the orbital plane of the solar system as a flat plate. Most of the planets orbit around the Sun on the “surface” of the plate. Rather than having their north and south poles point directly perpendicular to the plate, most planets have their poles at a slant. This is particularly true of Earth, whose poles are tilted 23.5 degrees.