What happened to flags on 1 September
3 flags in the atlas carry this date. The sentence under each one is where that is written down, in its own article.
- Eritrea 1961
On September 1, 1961, Hamid Idris Awate brought back the blue flag suppressed by Haile Selassie.
From Flag of Eritrea on Wikipedia, as it read on 2026-08-26
- Brazil 1971
The official design is defined by Law No. 5,700, issued on 1 September 1971.
From Flag of Brazil on Wikipedia, as it read on 2026-08-29
- Azerbaijan 2010
On 1 September 2010, the flag was officially raised to open the museum; subsequently becoming the world's tallest unsupported flagpole, until being overtaken by Tajikistan's 165 metre Dushanbe Flagpole in 2011.
From Flag of Azerbaijan on Wikipedia, as it read on 2026-08-29
How a day gets onto this site
A flag is here because a sentence in its own English Wikipedia article puts it on this date, and that sentence is printed above. Nothing was worked out from a year, and nothing was written for the occasion. Every sentence names the article it came from and the version of that article it was read in, so you can go and check it.
The calendar is still short rather than full. A third of the year has no page here, because a flag only gets a day when a sentence in its article puts something on one, and plenty of articles never do. Nothing is invented to fill the gap.