Astrology is an attempt to explain earthly matters according to the way in which celestial objects relate to one another and the Earth. It has been around for approximately 4,000 years, and its development coincided with the first time people started to study the stars. However, it is a common error to conflate astronomy, the scientific study of the heavens, with astrology which is another pursuit altogether. The practice has often been used to try and explain earthly phenomena according to the position of planets and various constellations of stars in the sky. Often – although not exclusively – the alignment of such celestial bodies is associated with dramatic events or even calamities. It is also commonly used to come up with horoscopes, often connected to the make up of the heavens at the point of someone's birth.