A beautiful blood-red sunset formed over the sky in Rizal, the Philippines on July 19.<br /><br />Onlooker Jan Michael Alejo said he was lucky to have captured it on video since it only appeared briefly before nightfall.<br /><br />He said: "Yesterday's red sunset I think is the most blood red sunset I've seen. It's like I'm in the beach when I'm really just in the city."<br /><br />The red colour in the sky at sunset is due to an effect called "Rayleigh Scattering." This means a large amount of blue and violet light has been scattered so you see a longer wavelength which appears to be red.<br /><br />A red sky at night also means that high pressure is moving in from the west and the next day will be sunny.<br /><br />While a red sky in the morning signals that high pressure has already moved east, giving way to low pressure with wet and windy weather.
