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August 18 Birthday

Zodiac sign, birthstone, birth flower, numerology, and real history for August 18.

Zodiac Sign

Leo

Birthstone

Peridot, Spinel

Birth Flower

Gladiolus, Poppy

Numerology Day Number

9

Famous Birthdays on August 18

  • Virginia Dare (1587)

    The first child born in the Americas to English parents, born in the Roanoke Colony; the colony's fate remains unknown after it was found abandoned in 1590.

  • Meriwether Lewis (1774)

    American explorer who, with William Clark, led the Lewis and Clark Expedition across the western United States from 1804 to 1806.

  • Robert Redford (1936)

    American actor and director known for Butch Cassidy and the Sundance Kid and for founding the Sundance Film Festival to support independent film.

This Day in History

  • 1868French astronomer Jules Janssen observed an unexplained spectral line during a solar eclipse in India, leading to the discovery of the element helium before it was found on Earth.

  • 1877American astronomer Asaph Hall discovered Phobos, the larger of Mars's two moons, at the U.S. Naval Observatory, days after discovering its companion moon Deimos.

  • 1920The 19th Amendment to the U.S. Constitution was ratified when Tennessee became the decisive 36th state to approve it, granting American women the constitutional right to vote.

What August 18 Says About You

Discovery, in more than one sense, defines August 18. Some of it is literal and celestial: Jules Janssen's 1868 observation of an unfamiliar spectral line during a solar eclipse in India led to the identification of helium, an element found in the sun's spectrum years before it was ever isolated on Earth — a discovery made by looking outward before anyone thought to look closer to home. Nine years later on the same date, Asaph Hall discovered Phobos, the second of Mars's two small moons, capping off a short but historic observing run at the U.S. Naval Observatory. Meriwether Lewis, born on this date in 1774, led an expedition built entirely around discovery in the more grounded, geographic sense — mapping a route across western territory that was, to the U.S. government commissioning the trip, officially uncharted, even though it was of course already known intimately to the Indigenous nations living across it, a fact the expedition's own journals increasingly had to reckon with as they depended on that knowledge to survive. Virginia Dare, born on this date in 1587 at the Roanoke Colony, represents the date's oldest and strangest unresolved mystery rather than a discovery at all — she was the first English child born in the Americas, and when a resupply ship returned to the colony three years later, every colonist, infant Dare included, had vanished without a confirmed explanation that survives to this day. Robert Redford, born on this date in 1936, spent the later part of his career institutionalizing discovery of a different kind, founding the Sundance Institute and festival specifically to give unconventional independent filmmakers a venue that Hollywood's studio system otherwise overlooked. The 19th Amendment's 1920 ratification, achieved when Tennessee became the deciding 36th state, wasn't a discovery so much as a hard-fought legal recognition of something that had been true and denied for the entire life of the American republic up to that point — women's fundamental claim to the vote. As a Leo date, August 18 carries the sign's exploratory confidence in Lewis's westward expedition and Redford's festival-building, alongside genuine open questions in Dare's unresolved fate. The numerology day number for the 18th reduces to 9, tied to completion, an apt but unsettling match for a colony whose story never actually got one. Hall's back-to-back discoveries of Mars's two moons within the same week, meanwhile, are as close as this date's history comes to an actual clean, satisfying finish. Redford's founding of Sundance decades later gave that same discovery-minded spirit an institutional home, one built specifically to keep discovering filmmakers the traditional studio system routinely overlooked.

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Shop Peridot birthstone gifts

Genuinely useful gift ideas for a August birthday — pick real peridot (not glass or dyed imitation) and things that keep.

Peridot stud earrings or pendant

A classic, wearable-every-day option — look for genuine peridot (not glass or dyed imitation) in sterling silver or gold vermeil settings.

Engraved birth-month jewelry dish or keepsake box

A small tray or box engraved with the birth month or date — practical, keepable, and works for any age.

Birth-flower botanical print

A framed print of that month's birth flower makes a low-cost, genuinely personal gift that pairs well with a birthstone piece.

Personalized birth-date star map or calendar print

A print showing the night sky or a custom calendar page for the exact date — a distinct, non-jewelry option for the same occasion.

Frequently Asked Questions

What zodiac sign is August 18?

August 18 falls under Leo, whose standard range runs from July 23 to August 22.

What happened to the Roanoke Colony where Virginia Dare was born?

Virginia Dare was born at the Roanoke Colony on August 18, 1587; when a resupply ship returned in 1590, the colonists had vanished, and their fate has never been confirmed.

What amendment was ratified on August 18, 1920?

Tennessee's decisive ratification on August 18, 1920 came down to one legislator, 24-year-old Harry Burn, who switched his vote after his mother mailed him a note urging him to 'be a good boy' and support the measure.

What is the numerology day number for August 18?

The 18th reduces to day number 9, traditionally associated with completion, endings, and empathy.