The word 星期五 (xīngqīwū, meaning "Friday") is formed through a direct conceptual and historical construction: it combines 星 (xīng, "star"), referring to the traditional Chinese system of naming days after the "Seven Luminaries" (the sun, moon, and five visible planets), with 期 (qī, "period" or "cycle"), to mean "week". The final character 五 (wǔ, "five") numerically denotes its position as the fifth day in the modern seven-day weekly cycle, which was adopted and integrated with the celestial naming convention, thus creating the literal meaning "star-cycle five" or "fifth day of the week".