How would people living in eternal day learn that stars exist?

Question

In a world I am building, the day lasts longer than the year, 9 times longer in fact. The native people of this world have been forced to migrate around the world, both avoiding the scorching desert of noon and the freezing winter of night. This world is otherwise rather unremarkable on the surface. Outside of the planet is a ring as well as many small moons, so many that the tides are rather small and unpredictable, but as I was designing their culture I realized something, without seeing the stars, would the have astronomy?

How would a species that lives in eternal day have any knowledge of the stars?

Answer 1

The poles provide the ability to stay on either side safely.

Since the planet has a relatively small axial tilt (13 degrees), the North and South poles of this planet shouldn't be incredibly cold relative to the rest of the world.

They would be inhabited, just like the rest of the "belt" that spans the planet. Observers at the either pole could (somewhat) safely foray into the night area and back without being stranded in either condition (night or day), having the sunrise/sunset zone nearby. This could mean safe stargazing throughout an entire lifetime, and develop astronomy.

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Compared to other ideas

• This phenomena allows astronomy to develop at a constant rate, as opposed to allowing a few observations every time there is an eclipse (as other answers suggest).
• This also accounts for the danger posed by 4.5 years of constant sunlight or darkness by providing a means to switch to the other side. Comparatively, answers that suggest "people want to explore" do not account for the resulting deaths of those explorers when they cook or freeze, subsequently wasting all that they learned.
• Some answers suggest that the sunrise / sunset zone has enough clarity to see stars and planets, but all spectra recorded will be tainted with sunlight; you need "true night" to get accurate results and determine more about the stars.
• While traveling from base to base, as some answers suggest, may seem effective in practice, locating the same bases when given the entire hemisphere may be challenging - and bases will likely be damaged severely by frost or heat.

Answer 2

People are curious

Humans, at least, are very curious. Shamans on spirit journeys, young men on adventures, and outcast groups in exile might all end up traveling into the night zone for one reason or another. And if they had not seen stars before, they would be amazed, and behold them with wonder.

Once word got out of these stars, many of the religious or scientifically minded would want to go check them out.

Answer 3

If they're avoiding both the heat of the day and the cold of the night then there are dawn and dusk people.

Most likely you have four main groups, two who move constantly and two who move and settle for long periods.

The dawn tribe will move until they start seeing stars, then it's time to settle until the heat of the day catches up with them.

The evening tribe will move when the first stars of the evening start showing as the signal that the temperature is going to drop.

Both these groups will overhaul the constantly slow moving tribes in their sectors when they move and those who move further ahead at dawn or stay later in the evening will tell stories of the heavens lighting up with stars at the extreme of the survivable temperatures.

Answer 4

Total Eclipse

I know this isn't directly an answer to your question, but the novelette Nightfall by Isaac Asimov deals with a civilization living on a planet in a system with six suns which keep the whole planet continuously illuminated. The people have no actual awareness of any stars beyond their local solar system, as they cannot see them and they are too distant to detect their gravitational influence.

Every 2050 years, another planet in the system coincides with the positions of the six suns and the civilization's world such that, for one brief interval of a few hours, for one side of the world 5 of the suns are "set" and the sixth is eclipsed by the other planet. For those few hours, a world that has always known daylight is plunged into darkness.

The story goes on to describe the catastrophic effect that one brief night has on the civilization—and indeed has had on every civilization that world has brought forth in its past as well. It's a good read.

But the mechanism of a global nightfall caused by an eclipse would provide a means for the people in your world to learn that other stars exist. (And the story may give you some ideas about how that people might react in the face of that discovery.)

Link to complete short story: https://www.uni.edu/morgans/astro/course/nightfall.pdf Was later made into a novel of the same name.

Answer 5

Visual Discovery in Dark Areas

If your scenario allows for people to venture into dark areas where stars are visible to the naked eye, then certainly that will be the easiest way for people to discover stars.

Non-Visible Light Astronomy

If your scenario requires people to stay in areas where stars are not visible to the naked eye, then techniques other than visible-light astronomy will need to be used. I'm not sure if all wavelengths in the electromagnetic spectrum have star detecting applications, but many do:

(Source)

Gravitational fields are also means of detecting stars.

Problems of Developing Technology in Nomadic Cultures

Depending on how much time they are required to keep moving to avoid the noons and nights, they might not be able to develop enough technology to reach modern Earth's levels of technology. So many factors of modern technology have evolved in stationary workshops, where large, heavy, non-mobile things like a blacksmith's forge or a steel foundary's massive smelting apparatus can be built, maintained and operated.

Metalurgy and other technological fundamentals might be difficult to develop in a very actively nomadic culture. For example, if the days last for 9 years, but the planet is millions of miles wide, they may be required to move extremely rapidly all the time to stay safe from the noons and nights. If the planet is only the size of our moon, though, they could stay in one place for many earth years on end before having to move to a safer location, giving them time to build shops in which to develop non-mobile technologies (like Very Large Array telescopes.) If they do have enough time to build shops, but later have to move on, if they aim to, they can eventually come back to their shops when they have gone all the way around their planet. This would allow them to use stationary technology, just at a different pace and style from the way it developed on Earth.

So, the size of their planet will play a huge role in shaping their development of non-visible light astronomy technology.

Answer 6

In addition to the three good answers so far received, the people of your planet would almost certainly be able to see certain astronomical objects by daylight. On Earth even in daytime we can regularly see with the naked eye the moon, obviously, plus several planets, some meteors and comets, and supernovae when they occur.

It is true that one cannot normally see stars in daylight from Earth except during a solar eclipse. The moons of your world are small, so a situation like an Earthly solar eclipse, when the shadow of a moon apparently blacks out the sun entirely, will presumably never occur. Nonetheless you might get partial darkening when a moon passed between your planet and the sun, enough to see a particularly bright star. Your world might simply have brighter and/or nearer stars in its sky so that keen-eyed people can spot them when conditions are good.

In any case, given that your planet's people will be able to see some astronomical objects there is no reason why the science of astronomy should not get started. Telescopes have many other uses than astronomy so would most likely be invented anyway.

The brave and curious will make special expeditions to the night side of the planet as suggested in previous answers. In fact astronomy is not the only reason why they might want to visit the night side - doing so could bring them advantage in war, if, for instance, they wanted to launch a surprise attack from an unexpected direction. Trade expeditions might wish to take the shortest route possible even if it did mean wrapping up warm. People might simply wish to check up on their property, to which they intend to return the next day. Criminals and refugees might flee their pursuers to the twilight zone where survival is less difficult than in areas of full night. These travellers through the night and twilight zones will be intrigued to see that unlike the familiar celestial objects these other lights appear to hold their places in the sky. There might be religious pilgrimages to see this wonder.

Answer 7

Build a telescope.

A decent telescope can see stars even during the day. For a people dependent on crossing more or less unfamiliar ground all the time being able to see far ahead would be of tremendous value so telescopes would be built and refined if they have the technology to make them at all.

Answer 8

This is not a truly nomadic culture as they are able to follow the same route over and over. Assuming adequate cooperation between the sunrise population and the sunset population they can become not quite so nomadic.

In their spare time they can build structures of use a bit at a time. They will have to move on before it's done (there's no point in such construction unless it's going to be good for centuries) but in time they will come back to it. Once they have weather-protected storage they can build spare tools and leave them behind--this reduces the amount of material they must lug and thus frees up time. More tools, an easier life. Eventually you will have a society where instead of eternally trudging around the planet they move from base to base, traveling very light between the bases and with a very good road connecting these bases.

Now we are able to start playing with science. In time they will develop photography--and just because people can't survive the extremes doesn't mean a camera can't.

Progress will be exceedingly slow but it will happen.

Answer 9

It seems reasonable that the near edge of the night zone won't be too hostile for several days and it is also fairly likely that people might end up there because of delays or accidents.

Equally as mentioned in another answer humans have a very long history of venturing into hostile environments. After all there is quite a bit of tourism to the arctic to see the northern lights so it's not a big stretch to imagine that people might linger in the night zone for a while just to see the stars.

Once you get any sort of scientific culture established it is entirely plausible that scientist might set up bases to venture into the 'deep night', for comparison just consider the expeditions of people like Shackleton, Scott, Amundson ect to the poles all of which were extremely arduous and dangerous. Indeed in this case you don't even have to go anywhere just wait for the night to catch up so building a well stocked base isn't that unfeasible.

As well as curiosity there could be economic motivations, perhaps there are animals which live in the night zone which are sought out by hunters for fur, meat or fat, indeed in this world ice could well be a valuable commodity, as indeed it was before the advent of refrigeration.

Answer 10

A low-density atmosphere and a solar eclipse

The sky brightness may be strongly reduced with an atmosphere of low density and/or fewer molecules and dust that disperse light. For instance, removing a bunch of nitrogen and ozone could strongly reduce the sky brightness.

A solar eclipse could further reduce it to levels where stars become visible.

Answer 11

Why not? Bear in mind that sometimes we can see our moon during the day. If the celestial objects are big enough, close enough and reflective enough, at the right angle they can be seen even in broad daylight. It's just a matter of size and brightness. So these people probably would've seen some of these objects, or even part of the ring. Their curiosity for the sky would take flight from there.

Answer 12

Brave and foolhardy early explorers, doomed though they were, may have managed to communicate images of, and/or comments on, what they saw in the Shadow Zone before they froze. Perhaps they managed to send images, or even stream movies, via wireless communication technology. Perhaps they left material behind on some sort of storage media. Even hand drawings and writings would be enough to establish that there's Something Up There. I'm assuming each sub-culture or tribe will have established markers around the planet, its own Road or Path or Belt to help them re-visit the same useful places on every Go-Round. So it's not inconceivable that such artifacts would be picked up again.

Subsequent to that initial discovery, how it plays out will depend on the level of technology. To me the idea that this society has access to advanced technology is only a slightly bigger stretch than the idea that they've survived at all (due to factors that others have mentioned here). Perhaps they're relics of long-ago stranded space-farers? Whatever the history, if they have some reasonably advanced technology, then this might include the wherewithal to set up unmanned observation stations in the Death Zones. Or perhaps insulated, heat-shielded, climate-controlled bubbles that would allow people to actually live there, much like our own Antarctic researchers or conceivable near-future colonists of the moon or Mars.

Even at a lower tech level, localized quirks of geology might make survival possible: a deep enough hole in the ground might insulate you from the big scorch, and various geothermal features might provide enough heat to help you survive the big freeze (even, in some places, close enough to the surface to allow for star-gazing).

Answer 13

Do these people have basic electrical technology? If so, they could build a radio telescope. Radio telescopes work just fine during the day because radio waves aren't diffused by the atmosphere as much as visible light is. You could see the stars with a radio telescope the same way you can see the stars when you're in outer space. (Speaking of which, they could see the stars for themselves if they built a spaceship.)

They may also be able to see the stars if their local astronomical neighborhood was more crowded than ours. Multiply the brightness of our brightest star by ten times and it'll be visible during the day. This could have happened if the stars in our neighborhood were a little closer or a little brighter. The same goes for planets. Comets are already sometimes visible during the day, though this is a bit off-topic.

Answer 14

If you go down a well, even in full day light you can see the stars... that's how one of the early Greeks realised the stars were there in the day, hidden behind the bright sunlight.

So, if your nomads ever dig a well...