The Japanese festival Tsukimi, or moon-viewing festival, often occurs in September. The constellation Pegasus becomes highly visible in September skies. The Ryder Cup golf competition is frequently played in September. Google was officially founded in September 1998 by Larry Page

The claim combines several factual statements about events and phenomena occurring in or around September. The Japanese festival Tsukimi, or moon-viewing festival, traditionally takes place in mid- to late-September, aligning with the lunar calendar. The constellation Pegasus does become more visible in the northern hemisphere's night sky starting in September, although it is not exclusive to that month. The Ryder Cup golf competition, however, is not frequently played in September; it typically occurs in late September or early October but varies by year and is not a fixed September event. Lastly, Google was indeed officially founded in September 1998 by Larry Page and Sergey Brin. The sources provided are insufficient and unreliable, with only general knowledge and widely accepted facts supporting the claim. Therefore, while most elements are true, the statement about the Ryder Cup’s frequency in September is somewhat misleading.