The Seven Sisters at Halloween

When Have You Last Gazed at the Pleiades?

January 29, 2019
Pleiades Star Cluster
Antonio Fernandez-Sanchez/NASA

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It’s an annual autumn ritual: The reappearance of the glorious Seven Sisters. During Halloween week, they always rises in the east before 7 PM and are nicely up after 8 PM. Learn more about the Pleiades—and their connection to All Hallows’ Eve.

The Pleiades is a tightly packed cluster of stars. There’s nothing else like it. No obstetrician attended the birth of the Pleiades, 60 million years ago. As these fiercely hot suns awakened from the dazzling and dangerous gaseous nursery, the newborn stars materialized like a distant sunrise in the skies of Earth 400 light years away.

History of the Pleiades

They seem harmless. But that wasn’t always the case. In ancient times, the Pleiades had a strange, sinister reputation. Such medieval rituals as the pagan Black Sabbath and All Hallow’s Eve (which evolved into our own Halloween) were set to occur when the Pleiades reached their highest point at midnight. Some have speculated that the rituals could have originated as a sort of commemoration of some ancient catastrophe that resulted in great loss of life. Some believe they may be linked to the Atlantis myth, itself perhaps a legend evolved from the awesome eruption of the Santorini Volcano in 1450 BC that devastated the Minoan civilization on nearby Crete.        

The Pleiades had an odd importance to civilizations throughout time and around the world. In Egypt, they were revered as one of the forms of the goddess Isis. In ancient Persia, the date in which they reached their highest midnight ascendancy was marked with ceremony. In Mayan and Aztec culture, this same yearly occasion had a forbidding undertone, and was given tremendous importance—with at least one city’s streets and pyramid aligned with the setting of the Pleiades.

Stars of Subaru

In Japan, the star cluster’s ancient name is Subaru. Until very recently, the six companies that merged to produce automobiles in 1953 placed a crude star map of the Pleiades on each of their cars. Over the years, its single brighter star has been portrayed as ever-more luminous and increasingly separated from the others, perhaps revealing some sort of corporate infighting.

But why seven sisters? That’s the real mystery. After all, normal eyesight readily sees only six, the same number found on the Subaru insignia.

If you can see a seventh, then you should be able to see an eighth as well. How many you can perceive tells as much about the purity of your sky as the state of your vision. With good eyes in a rural setting, nine are a cinch, and even eleven aren’t impossible.


The Lost Seventh Sister

Why have civilizations as disparate as the ancient Greeks, Australian aborigines, and Japanese all possessed legends of the “lost Pleiad” which have persisted through the centuries? Even two thousand years ago, a Greek poet wrote:

           “…their number seven, though the myths often say…that one has passed away.”         

One clue is that, as binoculars reveal, they’re blue—a color that indicates stellar youth. Young, hot, giant stars are often unstable, gobbling up their nuclear fuel in an adolescent frenzy that frequently produces instability.

They’re in their infancy even today: our own sun has been around 250 times longer. The dinosaurs gazed unconcernedly into a sky empty of the Sisters, which sprang into view just before we ourselves did. So maybe one of these newborns lost a bit of its light. In any case,  since all massive stars die young, the Pleiades will be long gone when most of the galaxy’s stars are still enjoying middle age. Toddling gracefully across November’s chilly skies —and very much linked with Halloween—the newborn sisters are only for now.

What’s the Moon phase this Halloween? Check out our Moon Phase Calendar to find out!

About This Blog

Welcome to “This Week’s Amazing Sky,” the Almanac’s hub for everything stargazing and astronomy. Bob Berman, longtime and famous astronomer for The Old Farmer’s Almanac, will help bring alive the wonders of our universe. From the beautiful stars and planets to magical auroras and eclipses, he covers everything under the Sun (and Moon)! Bob, the world’s mostly widely read astronomer, also has a new weekly podcast, Astounding Universe

Reader Comments

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Seven Sinister Sisters

Ah, I forgot about this. Thank you for reminding me, and thanks to Jack Horkheimer for first introducing me to this.

The Pleiades

I enjoyed your article about the seven sisters cluster of stars. Even God thought there was something special about them. In his conversation with Job showing him through creation of His greatness, the scripture says, "Can you bind the beautiful Pleides?" (The footnote says twinkling). Job 38:31.


Great info, thanks for sharing.

Thanks Bob for your awesome

Thanks Bob for your awesome articles, I need a daily pop-up on my computer to remind me: look up at the sky!!! But until then I have the almanac website.

In the late evenings I enjoy

In the late evenings I enjoy looking at all the stars and some of my favorite constellations. But I had no idea what I was looking at!! Thank you for sharing the history of it all!

The Sisters!

I've always been a big Sisters fan; love when I can spot them in the night sky. The tie to the Subaru insignia is very interesting! Thanks for the history lesson--I enjoyed it!

Your article on the Pleiades

Wow, the author has no clue about the place of the Pleiades in US American tribal history. He only needed to look to the Cherokee Nation for our stories about where we believe we originated. Not only us, but the Onandaga, and tribes throughout the East and Southwest have similar beliefs. We are still alive. You didn't have to reach to the Mayans and Aztecs of Mexico. Please do your homework next time. The Pleiades are sacred to us, not menacing!

Response from Bob, Almanac astronomer

The Editors's picture

   I’m glad you read my article, but I wish that insults weren’t part of your communications style. I put a lot of work into these little articles, so, suggesting I don’t do my homework is just plain insulting.

   In fact, I am well aware of the Pleiades’ larger connections with many cultures including Native American lore. But this article, if you will look it over a bit more carefully, is solely about its association with Halloween, and thus about the odd link with the many disparate civilizations that felt an eerie or spooky connection with this star cluster and linked it with catacylsms or loss of life. There was actually more than I had room for.

   If, instead, this piece was about the “sunnier” side of the Pleiades, I might have brought up other Native American views, or indeed I might have discussed astronomy’s many fascinating discoveries about it, or even delved into its link in the Bible and in classical literature, as when Tennyson wrote, “Many a night I saw the Pleiades rising through the mellow shade, shimmering like a swarm of fireflies tangled in a silver braid …”

   Fireflies tangled in a silver braid! Gorgeous imagery! I always found that verse so beautiful, I just now typed it verbatim from memory. So, no, I hardly need to be reprimanded just because your particular heritage wasn’t mentioned in this particular blog!

–Bob Berman

Love the imagery too!

Your columns are very interesting, and I copied and pasted the Tennyson quote. Hope to memorize as well! Happy Halloween!


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