September 20 is the 263rd day of the year (264th in leap years) in the Gregorian Calendar. It is preceded by September 19, and succeeded by September 21. Following September 20, there are 102 days in the year.
Blavatsky's Gem of the Day
"We are the true troglodytes, cave-dwellers, though we call our cavern the world."
- None listed for this date.
- 1844 – Mary E. Foster, Hawaiian Theosophist and philanthropist who supported Anagarika Dharmapala and the Maha Bodhi Society of India in repair of temples and construction of schools (d. December 20, 1930)
- 1933 – Annie Besant, English Theosophist, women's rights activist, supporter of Irish and Indian self rule, and second International President of the Theosophical Society (Adyar), serving from 1907-1933. (b. October 1 1847)
Holidays and observances
- Young Theosophists Day, established to commemorate Annie Besant's death.