Why is Cygnus is visible to an observer in Manila in September but not in March?

Cygnus is visible to observers in Manila in September because it is positioned high in the night sky during that time of year, making it easier to spot. In contrast, by March, Cygnus is lower on the horizon during the night and may set earlier, reducing visibility. Additionally, seasonal changes in the Earth's position relative to the stars affect the visibility of constellations throughout the year.