You made it time. If you want to look a little longer, just scroll back up and press “Continue.”

Look up.

Before you commute home to suburbs like Tarrytown and Larchmont, or race toward the next stop on your tourist map, take a minute.

Look up to see the stars.

One hundred and twenty-five feet above you are 2,500 stars and six signs of the zodiac along the ecliptic, a line that represents the path of the sun across the sky:

The signs are joined by a few others: Orion, Pegasus, Triangulum and, in the center of it all, Musca Borealis (the Northern fly, or sometimes called Apis, the bee). The Milky Way streaks across the ceiling in the opposite direction. The whole thing is ringed by intricate plaster moldings along the clerestory windows. Fifty-nine of the stars twinkle.

Who says there isn’t magic in Midtown?

The original early 1900s plan for the ceiling was to build a massive skylight so commuters could look up at the actual stars:

But time and money were short, so the architects asked the artist Paul Helleu to design a version of the sky on the ceiling instead. Helleu took inspiration from star atlases from the 1600s. His main resource was the Uranometria from 1603, a lushly illustrated volume that was the first detailed cataloging of individual stars, their positions and brightness. See how similar the figures are. This is Aries:

Here’s Taurus, the bull:

A heart balloon — one of several — had floated up the day we took this photograph, nestling between Orion’s club and Taurus’s horn (maybe an earthly sign that this heavenly hunt might finally resolve).

Converting the flat drawings of a spherical sky re-projected onto a semi-cylindrical vaulted ceiling would have been no easy task. The design work was done by a famous scenic designer and muralist, James Monroe Hewlett, and was overseen by the Columbia astronomy professor Harold Jacoby, who in 1910 assured a panicked public that Halley’s comet would not hit Earth.

Dozens of painters got to work. The terminal opened at midnight on Feb. 2, 1913. The New York Central Railroad boasted “that many school children will go to the Grand Central Terminal to study this representation of the heavens.”

Two weeks later, a commuter from New Rochelle (and a hobby astronomer) looked up at the ceiling and realized that west was east and east was west and the sky was not, actually, in a proper arrangement. Only Orion was shown in the “correct” orientation. He wrote a “wrathful” letter to the station. As The New York Times reported in 1913, officials at Grand Central “did not deny the charge that things were a bit mixed, but held that it was a pretty good ceiling for all that.”

How this happened is still a matter of debate, given Professor Jacoby’s astronomical blessing.

Michael Allison, a former NASA planetary scientist at the Goddard Institute for Space Studies (and a former adjunct in the Columbia astronomy and astrophysics department), met me last month at the great clock under the ceiling to explain his theory.

“I’ve stared at the ceiling I don’t know how many hours,” he said. “I keep hoping I can discover one more thing.”

The liberties taken, Mr. Allison said, like re-sizing the constellations to fit the space and flipping Orion (in relation to the rest), were carefully done. Ultimately, a good marriage of art and science. He thinks Jacoby was a victim of big project bureaucracy, that it was all a mixup.

Jacoby probably expected the design he approved to be projected overhead, where the result would match the plans if you held them above you. The painters put them on the floor instead. Hence, the flip.

But this “heavenly view” — the stars as if they could be seen from above, looking down — may not be a bad view at all.

“There are just so many bad things happening in the world now that I think the sky offers a perspective that can lift us above that,” Mr. Allison said.

For Deirdre Newman, the great-granddaughter of the muralist Hewlett, who painted the ceiling, the imperfection “is what art is.”

Ms. Newman, it turns out, is also a painter of murals and ceilings. But these days, if she has to flip an image, she just hits a button on the projector.

“Anytime I make a mistake painting, I’m like, this proves that it’s art,” she said. “It is not perfection, and it shouldn’t be — it would be a sad thing if it was.”

The stories that we’ve given to the stars over millenniums, some of the most retold tales in history, are hardly orderly — stories of fate, violence, betrayal, revenge, sex and punishment. Cancer helps Hera in pinching a rival’s foot. Orion, son of Poseidon, is placed in the stars by Zeus, locked in an eternal hunt. The two fish of Pisces (Aphrodite and Eros) are linked together to escape the monster-of-all-monsters, Typhon.

Or the stories are totally different if you were Babylonian or Egyptian, Greek or Roman. Today, the stars mean something else again to a devoted user of the horoscope app Co-Star, seeking reassurance after a breakup. And to a commuter standing in Grand Central, looking up while waiting for the train, the stars might just be a momentary diversion, a decorative way to pass the time. Or more.

Take what you want. Take what you need.

***

By the 1940s, the ceiling had fallen into disrepair, so they painted a whole new one on four-foot-by-eight-foot asbestos sheets over the old one. This is the version that exists today. Eventually that second ceiling, too, grew dark with grime and had to be cleaned from 1996 to 1998. The difference was stark. As you were zooming in, you may have noticed a little dark square by Cancer. They deliberately left one bit of the uncleaned ceiling here:

The best time to take all of it in — the ceiling, and the majesty of the station — might just be coming this weekend. The setting sun will line up with Manhattan’s street grid and should (pending clouds) bathe the terminal in a beautiful golden glow Saturday at 8:19 p.m. and Sunday at 8:20 p.m. I plan to be on the east balcony looking west on Sunday for that moment.

See you there.

How we took the photograph

To generate a high-resolution panorama of the ceiling, The Times captured 232 close-up images. We then used software to stitch these photos into an equirectangular projection, to approximate the curve of the ceiling. We also developed custom computer vision software to ensure consistent color blending across varying lighting conditions. To optimize for display efficiency and clarity during navigation, the image was then re-projected into the shape of a cube. We think it’s still a pretty good picture for all that.

This is an installment in our series of experiments on art and attention. If you liked this one, you may like these past exercises: a finished, unfinished portrait; a sudden rain over a bridge; a unicorn tapestry; some buckets from Home Depot; and a Whistler painting.

Sign up to be notified when new installments are published here. And let us know how this exercise made you feel in the comments.

Welcome to Day 2 of the Metropolitan Diary challenge, part of our celebration of the column’s 50th anniversary. On Day 1, we gave you tips for identifying your New York City story. Today, we’ll help you write it. (Missed Day 1? It’s not too late to start.)

What makes for a good Diary? It’s simply a good story that happens to be set in, and capture, the essential New York-ness of the city. While this isn’t a full writing course, we do have guidance on the kinds of elements that the submissions we publish include. They typically have: a beginning, middle and end; sharp details; catchy dialogue; a bit of surprise; some humor, warmth or emotion. But there is no formula, so flouting these loose rules can be worthwhile.

Don’t worry if you don’t think of yourself as a “writer.” Focus on being a “storyteller.” Pretend you are telling your story to the person who’d most appreciate it, using whatever conversational language or pacing that would hold their attention. Do it out loud if you want, maybe give that person a call and tell them your story (or tell it to them again). Then write it down.

That’s the big picture. For more tips, read on.

Here is an example of a published Diary that we (and readers) really liked, and a few thoughts on why that may help crystallize yours.

One of this item’s best qualities is that it is short and snappy. Only 53 words! Although we will use stories of up to 300 words, many don’t need to be that long and the column doesn’t work if we don’t have a mix of long, medium and short, so we are always looking for stuff like this. Here’s another one!

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At Attention

Dear Diary:

It was December 1967. I had just finished basic training at Fort Dix in New Jersey and was traveling to Boston in uniform. For reasons I no longer recall, I stopped in New York City on the way.1

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Walking on the Upper East Side2 in a snowstorm, I spied another man in a uniform. He was older, and his cap bore the familiar gold band that identified him as an officer.

I rendered a snappy salute. It was not returned. 3The uniform was unfamiliar, so I guessed he was a foreign officer. Military courtesy still required me to salute.

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A little farther down the street, I encountered another officer and offered another salute that went unacknowledged.4 His uniform was strange to me as well.

The third time it happened, the man I saluted ignored me while holding the door for a couple 5on their way into a large apartment building.

I realized I had been saluting doormen.6

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— Stephen Salisbury

To get your storytelling muscles going, think through or jot down the answers to some of these questions.

Let’s start with setting the scene.

Now, let’s move to the middle, the meat of the story.

And now, the end.

That’s it. Keep your story simple and use the kind of plain language you use in conversation. You are sketching a moment in time. The details are important. Let them move the story along. Have fun and good luck.

Once you’re done, read through what you’ve got. What details are less important and can be left out? (Remember, there is a strict 300-word limit.)

Write your Metropolitan Diary however you like, on paper, on your phone or wherever! When you’re happy with what you’ve written, put your diary entry into the box below, fill out your information and submit it. You might just hear from me about including it in a future column.