Once sunlight enters the Earth’s atmosphere, it collides into all types of water droplets, molecules and particles. This causes some of the light to scatter. Not all sunlight reaches the Earth’s surface. Different wavelengths are scattered differently by the Earth’s atmosphere. Close to sunset this difference is more noticeable and shorter wavelengths (blue and purple) are scattered more strongly than the longer wavelengths (red and orange). In Mathematics, when it comes to sunsets, light is considered a wave and as red has the longest wavelength of any visible light, the sun is red when it is on the horizon,
