What happened to flags on 3 September
2 flags in the atlas carry this date. The sentence under each one is where that is written down, in its own article.
- Australia 1901
The original version of the flag first flew as the Commonwealth blue ensign on 3 September 1901, after being selected alongside a merchant naval red ensign in a competition held following federation.
From Flag of Australia on Wikipedia, as it read on 2026-08-29
- Slovakia 1992
The current form of the national flag of the Slovak Republic (Slovak: Vlajka Slovenskej republiky) was adopted by Slovakia's Constitution, which came into force on 3 September 1992.
From Flag of Slovakia 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.