September comes from the Latin root septem-, meaning “seven”, because, in the original Roman republican calendar, September was the seventh month of the year rather than the ninth.
The constellations seen in the sky are Virgo and Libra.
It marks the end of the monsoon season, and nature gets a signal to gather up the rest of the harvest and prepare for the winters.
The disappearance of the monsoon clouds sets the tone for transitions.