Venus, as one of the brightest objects in the sky, has been known since prehistoric times and has been a major fixture in human culture for as long as records have existed. As such, it has a prominent position in human culture, religion, and myth. It has been made sacred to gods of many cultures, and has been a prime inspiration for writers and poets as the morning star and evening star. What is now known as the planet Venus has long been an object of fascination for cultures worldwide. It is the second brightest object in the night sky, and follows a synodic cycle by which it seems to disappear for several days due to its proximity to the Sun, then re-appear on the opposite side of the Sun and on the other horizon. Depending on the point in its cycle, Venus may appear before sunrise in the morning, or after sunset in the evening, but it never appears to reach the apex of the sky. Therefore, many cultures have recognized it with two names, even if their astronomers realized that it was really one object. In old English, the planet was known as morgensteorra (morning star) and æfensteorra (evening star). It was not until the 13th century C.E. that the name "Venus" was adopted for the planet (in classical Latin, though the morning star was considered sacred to the goddess Venus, it was called Lucifer). In Chinese the planet is called Jīn-xīng (金星), the golden planet of the metal element. It is known as "Kejora" in Indonesian and Malaysian Malay. Modern Chinese, Japanese and Korean cultures refer to the planet literally as the "metal star" (金星), based on the Five elements. Because the movements of Venus appear to be discontinuous (it disappears due to its proximity to the Sun, for many days at a time, and then reappears on the other horizon), some cultures did not recognize Venus as single entity; instead, they assumed it to be two separate stars on each horizon: the morning and evening star. Nonetheless, a cylinder seal from the Jemdet Nasr period indicates that the ancient Sumerians already knew that the morning and evening stars were the same celestial object.