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Seasons Why are there seasons? • The Earth’s axis tilts 23 1/2 from the perpendicular to the plane of the ecliptic and always points toward the North Star. • The Earth revolves around the Sun. 1.Daylength (=daylight period) The longer the sun shines, the hotter it gets! 2. Angle of Sun’s Rays The farther the angle is from 90º, the more spread out the Sun’s energy is. 3.Penetration (& filtration) of Atmosphere • The longer the path of sunlight through the atmosphere, the greater the filtration and the less energy striking the surface.