Birthday facts
Born on May 21.
Everyone born on May 21 is a Gemini — ruled by Mercury, two opinions, both sincere. The stone is emerald, the flower lily of the valley, and the day is shared with Lisa Edelstein and Philip II of Spain.
Your book
Born on May 21? Add the year.
Then it is a pop-up book: the sky the day you arrived, the No. 1 that week, the president, what a stamp cost, your life in weeks, and who was exactly your age when they did the thing they are known for — and at the end, a birthday poster of the day, engraved, to take home. One field. The date lives after the # in the link, which no server sees — nothing about you leaves your browser.
Making it for someone else? Send it as a pop-up birthday card.
The old books say
Gemini, May 21 to June 20.
The Twins, ruled by Mercury, the messenger — and so the books give the sign to talkers, writers, the quick and the curious. An air sign, credited with wit and adaptability and blamed for changing its mind, which its people would call keeping up. Two of everything: two opinions, two projects, two friends who have never met. The tradition finds it charming and slightly exhausting, in that order.
Astrology, reported rather than endorsed — the astronomy is the part of the book that is real.
Good company
Also born on May 21.
The names most looked up among everyone who shares the day — leaning on the ones who last.
On this day
What May 21 has seen.
It is International Tea Day.
The calendar
When May 21 falls.
A Thursday in 2026, a Friday in 2027, a Sunday in 2028, a Monday in 2029, and a Tuesday in 2030.