Some dates bring together moments that shaped science, political transitions and global culture. May 15 reflects events that influenced astronomy, national identity and leadership across different parts of the world. Here is a fact-checked look at five notable events tied to this day.
Johannes Kepler confirms planetary motion principles (1618)
On May 15, 1618, astronomer Johannes Kepler discovered the third law of planetary motion, explaining the relationship between a planet’s distance from the Sun and its orbital period. His work became foundational to modern astronomy.
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Las Vegas founded (1905)
On this day in 1905, the city of Las Vegas was officially founded when land was auctioned off, laying the foundation for what would later become a global entertainment hub.
Madeleine Albright born (1937)
Diplomat Madeleine Albright was born on May 15, 1937. She later became the first woman to serve as the United States Secretary of State.
International Day of Families observed (1993 onward)
International Day of Families is marked every year on May 15 to highlight the importance of families and address issues affecting them worldwide.
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Moscow Metro opens to the public (1935)
On May 15, 1935, the Moscow Metro was officially opened. It became one of the busiest and most architecturally distinctive metro systems in the world.
