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Obliquity of the ecliptic is the term used by astronomers for the inclination of Earth 39s equator with respect to the ecliptic or of Earth 39s rotation axis to a perpendicular to the ecliptic. It is about 23.4 and is currently decreasing 0.013 degrees 47 arcseconds per hundred years because of planetary perturbations.
Spur gears or straightcut gears are the simplest type of gear. They consist of a cylinder or disk with teeth projecting radially. Though the teeth are not straightsided but usually of special form to achieve a constant drive ratio mainly involute but less commonly cycloidal the edge of each tooth is straight and aligned parallel to the axis of rotation.