49 Fun Facts About Leo

In traditional astrology, Leo is said to govern which organ of the body?

The heart. Medieval doctors read the body sign by sign, from the head down to the feet, and the constellation's brightest star had long been called the Heart of the Lion.

Leo is which sign in the order of the zodiac?

5th. Astrologers pair each sign with the house of the same number, which ties Leo to the fifth house, the one that governs children, play and pleasure.

Which celestial body is the traditional ruler of Leo?

The Sun. Astrologers gave it the sign it crossed in the hottest weeks of the northern summer, while each of the five visible planets had to share its rule across two signs.

Leo belongs to which classical element?

Fire. Leo, Aries and Sagittarius sit four signs apart, so the three fire signs mark out a triangle on the zodiac wheel, which is why astrologers call each element's group a triplicity.

What is Leo's modality in astrology?

Fixed. A fixed sign holds the middle of a season, when the weather that began a month earlier has taken firm hold, and Leo sits in the middle of the northern summer.

Which sign sits opposite Leo on the zodiac wheel?

Aquarius. The water-bearer sits six signs away, directly across the wheel, and astrologers gave that far side to Saturn, the most distant and coldest planet they knew.

Someone born on which of these dates is a Leo?

August 8. The sign runs from about July 23 to August 22, yet by the sky's own boundaries the lion's season would not begin until around August 10, because the sky has drifted since the signs were set.

The sign Leo and the constellation Leo no longer line up because of which slow motion of the Earth?

Its wobbling axis. Called precession, the wobble takes about 26,000 years a turn and has slid the constellations almost a whole sign past the dates astrologers set some 2,000 years ago.

Which two constellations flank Leo in the zodiac?

Cancer and Virgo. The zodiac runs eastward through the faint crab, then the lion, then the maiden, so a planet on its usual course enters Leo from Cancer's side and leaves towards Virgo.

Which asterism, shaped like a backwards question mark, traces the head and mane of Leo?

The Sickle. Six stars curve up from the bright dot at the lion's chest, and the Leonid meteors seem to fan out from inside the blade, which is how the shower got its name.

Which is the brightest star in Leo?

Regulus. The star spins once in about 16 hours, so fast that it bulges at the equator into a squashed egg shape roughly a third wider than it is tall.

What does the Latin name of Leo's brightest star, Alpha Leonis, mean?

Little king. The Latin shrinks rex, king, and is no Roman relic: astronomers only gave it to the star in the 1500s, translating its far older Greek name, Basiliskos.

Alpha Leonis lies so close to the ecliptic that which body regularly passes directly in front of it?

The Moon. No other bright star sits so squarely on the ecliptic, so in some years the Moon covers it month after month; a run of 20 such occultations began in July 2025.

Which planet passed directly in front of Alpha Leonis in 1959 and will next do so in 2044?

Venus. Planets drift past this star all the time but almost never cross it: the 1959 passage was the last by any planet, and the next, on 1 October 2044, will be Venus again.

Leo's dates fall in July and August, but its constellation is best seen on evenings in which northern season?

Spring. In high summer Leo is up only by day, lost in the glare, so the lion rules the evening sky months earlier, standing highest around 10 p.m. in early April.

Which star marks the lion's tail, its Arabic-derived name meaning exactly that?

Denebola. The name shortens the Arabic dhanab al-asad, the lion's tail, and Deneb in Cygnus is the same word: it marks the tail of the swan.

Which astronomer of Alexandria listed Leo among the 48 constellations of his Almagest?

Ptolemy. His second-century catalogue described the lion star by star, with its brightest in the chest, and Leo is still drawn that way as one of today's 88 official constellations.

Which space telescope found methane and carbon dioxide in the air of K2-18 b, a planet in Leo?

Webb. The planet circles a red dwarf 120 light-years away in the zone where water could stay liquid, so a 2025 claim that the James Webb telescope had also sniffed a gas made by life drew headlines and doubt.

Wolf 359, a faint red dwarf in Leo, is the site of a famous battle in which fictional universe?

Star Trek. In The Next Generation a Starfleet armada gathers at the star to stop a single Borg cube and is wiped out, and Deep Space Nine later opens in the middle of the same battle.

What powers the sudden flares of Wolf 359, a faint red dwarf in Leo?

Magnetic energy. The whole star churns like a boiling pot, winding up a powerful magnetic field, and when that stored energy lets go the dim red dwarf brightens sharply for a few minutes.

R Leonis in Leo belongs to a class of pulsing red giants named after which star, 'the wonderful'?

Mira. Astronomers called it wonderful because it fades from plain sight and comes back, and R Leonis does the same every 310 days or so, dipping to telescope-only brightness.

Caffau's star in Leo, about 13 billion years old, startled astronomers in 2011 by containing almost none of what?

Heavy elements. Everything in it beyond hydrogen and helium comes to less than a 20,000th of the Sun's share, a sign it formed before earlier stars had forged much; in 2011 no star known was more primitive.

The Leo Triplet is a group of what?

Galaxies. M65, M66 and NGC 3628 are three spirals about 35 million light-years away, packed so close that their gravity has pulled one another's shapes out of true.

The Leo Ring, a vast intergalactic cloud in the constellation, is made of what?

Hydrogen and helium gas. Radio astronomers found the 650,000-light-year ring in 1983 and took it for untouched primordial gas, until 2010 images showed young stars in it and traced the gas to a cosmic collision a billion years ago.

NGC 2903, a bright barred spiral galaxy in Leo, was discovered in 1784 by which astronomer?

William Herschel. He wrote it down as two nebulae, and the second, later numbered NGC 2905, turned out to be nothing more than a bright knot in one of the galaxy's own spiral arms.

In 2013 astronomers announced a structure in Leo four billion light-years long, then the largest known, made of dozens of what?

Quasars. The Huge Large Quasar Group looked too big for a universe that should be smooth on large scales, but a still larger structure was soon reported, and critics argue the group is a chance pattern.

Which group of stars was cut away from the tuft of the lion's tail to form a separate constellation?

Coma Berenices. The name means Berenice's Hair: an Egyptian queen vowed her hair for her husband's safe return from war, and the astronomer Conon declared that her shorn locks had joined the stars.

The Leonid meteor shower is associated with which comet?

Tempel–Tuttle. The comet orbits in the opposite direction to Earth, so its dust meets our atmosphere almost head-on at about 70 km a second, which makes the Leonids the fastest of the yearly showers.

Roughly how often do the Leonids produce a full meteor storm?

Every 33 years. That is how long the parent comet takes to complete one orbit, and the fresh dust near it can turn a shower into a storm: in 1966 meteors fell by the thousand each minute.

The 1833 Leonid storm led Denison Olmsted to argue that meteors come from where?

A cloud of particles in space. Olmsted saw that every streak fanned out from one point in Leo and that Europe saw nothing, so it could not be weather; meteor science is dated from his study.

The great 1833 Leonid storm inspired which jazz standard?

Stars Fell on Alabama. The 1934 song appears to have borrowed its title from a book of the same year by Carl Carmer, a New Yorker who named his account of his Alabama years for the 1833 storm.

The Leonid meteors streak out of Leo around the middle of which month?

November. For all its fame the shower is a thin one in most years; its name was made by the rare nights when Earth runs into fresh comet dust and the meteors fall in a storm.

In Greek myth, Leo represents the beast Heracles killed as which of his labours?

The first. In the usual telling Heracles was atoning for killing his own children in a fit of madness, and an oracle bound him to serve King Eurystheus, who chose the tasks.

Why could the Nemean lion not be killed with ordinary weapons?

Its hide could not be pierced. When his arrows simply bounced off, Heracles gave up on shooting, took up his club and drove the lion back into its cave.

How did Heracles finally kill the Nemean lion?

He strangled it. In the usual telling he walled up one of the cave's two mouths, went in by the other and locked an arm round the lion's neck until it choked.

What did Heracles use to cut the pelt from the Nemean lion?

One of its own claws. The pelt he cut away became his cloak for the rest of his labours, with the lion's gaping jaws worn over his head like a helmet.

What did King Eurystheus have made to hide in when Heracles came back with the lion?

A buried bronze jar. He also barred Heracles from the city and from then on passed his orders through a herald rather than face the man he was supposed to command.

According to Hesiod, which goddess raised the Nemean lion and sent it to terrorise Nemea?

Hera. She hated Heracles as her husband Zeus's son by a mortal woman, and Hesiod has her rear the lion in the hills of Nemea as a plague on the people who lived there.

Which conqueror is carved wearing a lion's scalp, Heracles-style, on the famous sarcophagus from Sidon that bears his name?

Alexander the Great. The tomb was not his but is often assigned to Abdalonymus, a Phoenician king he put on the throne, and the lion skin is the mark of Heracles, from whom Alexander's dynasty claimed descent.

Which ancient people listed Leo in their star catalogues as UR.GU.LA, the lion?

The Babylonians. Their star lists, pressed into clay tablets more than 2,600 years ago, already put a lion in this part of the sky, so the figure is older than any Greek star list we have.

The Cosmic Horseshoe in Leo is a distant galaxy's light bent into a ring by gravity, as which physicist predicted?

Albert Einstein. A heavy red galaxy sits almost exactly in front of a far more distant blue one, and its gravity smears the background light into a near-complete circle, an Einstein ring.

Ancient Egyptians honoured Leo because its time of year brought which great event?

The flooding of the Nile. The river began to rise in the weeks tied to Leo's stars, so the lion became a sign of the flood on which every Egyptian harvest depended.

M65 and M66 in Leo take their numbers from the catalogue of which French comet hunter?

Charles Messier. He listed the fuzzy objects that kept fooling him during comet searches so that he could ignore them, and added this pair on a single night in 1780.

The Roman poet Ovid gave Leo which epithet?

Herculeus Leo. In his Art of Love, Ovid tells a man to stroll in the shade of Pompey's colonnade in the season of Hercules' lion, that is, at the height of summer.

Skywatchers find Leo by following stars in the bowl of which famous asterism southward?

The Big Dipper. Its two pointer stars are famous for leading north to Polaris, but run the same line the other way, out through the bottom of the bowl, and it lands on Leo.

Gliese 436 b, a Neptune-sized planet in Leo, trails what behind it as its star boils it away?

A comet-like tail. Hubble caught the planet's atmosphere being stripped away by the red dwarf it hugs, the escaping gas streaming out behind it like the tail of a comet.

Leo belongs to which polarity group of signs?

Positive (active). The two polarities alternate round the wheel like day and night, so every second sign, Leo among them, is counted as outgoing and the ones between as inward.

Leo Minor, the lion cub above Leo's head, was added to the sky in 1687 by which astronomer?

Johannes Hevelius. The Polish astronomer built the cub out of 18 faint stars that the Greeks had left outside any figure, and it is one of seven of his inventions still on the official list.

CW Leonis, a dying star wrapped in sooty dust, is faint to the eye but brilliant in which part of the spectrum?

Infrared. The star is burying itself in carbon dust it has thrown off, which blocks most of its visible light and glows with the heat instead; it went unnoticed until an infrared survey of 1969.