What Is 28 Sep

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Last updated: April 15, 2026

Quick Answer: 28 Sep refers to 28 September, the 271st day of the year in the Gregorian calendar, with 94 days remaining until year-end. Historically, it marks events like the 1941 Nazi massacre in Ukraine and the 2008 U.S. Open tennis final.

Key Facts

28 September is the 271st day of the year (272nd in leap years) in the Gregorian calendar.
On 28 September 1941, Nazi forces killed over 33,000 Jews at Babyn Yar in Ukraine.
Serena Williams won the 2008 U.S. Open women's singles title on 28 September.
The United Nations observes 28 September as World Rabies Day annually.
In 2023, 28 September fell on a Thursday and marked the 39th week of the year.

Overview

28 September, or 28 Sep, is a date with historical, cultural, and scientific significance. It occurs in the final quarter of the year during the autumn season in the Northern Hemisphere and spring in the Southern Hemisphere. This date has witnessed major events in warfare, sports, public health, and space exploration.

From tragic wartime atrocities to landmark achievements in medicine and athletics, 28 September stands out across centuries. Its recurrence offers a lens into how global events shape collective memory and progress. The date is also symbolically recognized for promoting global health awareness.

World Rabies Day: Since 2007, 28 September has been designated World Rabies Day to promote vaccination and awareness, reducing global deaths by an estimated 59,000 annually.
Babyn Yar Massacre: On 28 September 1941, Nazi Einsatzgruppen murdered over 33,000 Jews in Kyiv, Ukraine, in one of the largest single massacres of the Holocaust.
Tennis Milestone:Serena Williams claimed her third U.S. Open title on 28 September 2008, defeating Jelena Janković in three sets with a final score of 6–4, 7–5.
Space Exploration: On 28 September 2014, NASA’s MAVEN spacecraft entered Mars orbit, beginning a mission to study the planet’s upper atmosphere and climate change over 10+ years.
Political Transition: In 1990, East Germany’s parliament voted for reunification with West Germany, effective 3 October, marking a pivotal step toward German unification on 28 September.

How It Works

Understanding 28 September involves recognizing its role in annual cycles, historical timelines, and global observances. The date functions both as a chronological marker and a symbolic anchor for remembrance and action.

Gregorian Calendar Position: As the 271st day of the year, 28 September falls in the 39th week, with 94 days remaining until 31 December.
Leap Year Adjustment: In leap years, such as 2020, it is the 272nd day, shifting the remaining days to 93 until year-end.
World Rabies Day: Initiated by the Global Alliance for Rabies Control, this observance on 28 September aligns with Louis Pasteur’s death date, honoring his rabies vaccine breakthrough in 1885.
Historical Documentation: Archives from WWII record 28 September 1941 as the start of the Babyn Yar atrocity, later commemorated with memorials and educational programs.
Sports Scheduling: The U.S. Open tennis tournament often concludes on the first Sunday of September, but in 2008, scheduling delays pushed the women’s final to 28 September.
Astronomical Context: In 2023, the Moon was in its last quarter phase on 28 September, influencing tidal patterns and stargazing conditions globally.

Comparison at a Glance

Key events on 28 September across different years highlight its varied significance in history and science.

Year	Event	Significance
1941	Nazi massacre at Babyn Yar	Killed over 33,000 Jews in two days; major Holocaust atrocity
1990	East German parliament votes for reunification	Paved way for German unification on 3 October 1990
2007	First World Rabies Day	Global campaign launched; now observed in 150+ countries
2008	Serena Williams wins U.S. Open	Third title; won 6–4, 7–5 against Jelena Janković
2014	MAVEN spacecraft enters Mars orbit	Studied atmospheric loss; mission extended beyond 2020

These events reflect how a single date can encapsulate human tragedy, scientific advancement, and cultural milestones. While some occurrences are annual, like World Rabies Day, others are singular historical turning points. The convergence of such diverse events on 28 September underscores its multifaceted importance across disciplines and decades.

Why It Matters

Recognizing 28 September helps contextualize pivotal moments in history, science, and public health. It serves as a reminder of both humanity’s capacity for destruction and its progress in medicine, unity, and exploration.

Historical Memory: The Babyn Yar massacre on 28 September 1941 is memorialized to educate future generations about Holocaust atrocities and antisemitism.
Global Health: World Rabies Day has led to a 50% reduction in human rabies deaths in targeted regions through mass dog vaccination campaigns.
Scientific Achievement: NASA’s MAVEN mission, active since 28 September 2014, has provided critical data on Mars’ atmospheric erosion and climate history.
Sports Legacy: Serena Williams’ 2008 victory reinforced her dominance, contributing to her eventual career total of 23 Grand Slam singles titles.
Political Unity: The 1990 East German vote on 28 September accelerated German reunification, reshaping post-Cold War Europe’s geopolitical landscape.
Educational Impact: Schools and NGOs use 28 September to teach about zoonotic diseases, promoting responsible pet ownership and bite prevention in endemic areas.

From commemorating lives lost to celebrating scientific and athletic triumphs, 28 September embodies a spectrum of human experience. Its recurring observance fosters awareness, honors history, and inspires future progress.