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72 votes

Why would it be unfortunate for a day length to vary in a planet; other than that Java API developers need to work a few hours more?

It really bugs them What you've probably misunderstood is what the term "Java developer" actually denotes. Java developers are a small mammal similar to civet cats in Indonesia both in physical ...
nullpointer's user avatar
  • 8,709
61 votes

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

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 ...
kingledion's user avatar
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57 votes
Accepted

How do you tell time on a world with 9-year days?

Terrain objects I imagine these nomads are following the same paths every year as they perpetually circle the planet. In that case, since there are no seasons or months, each group's time cycle would ...
kingledion's user avatar
  • 85.5k
39 votes

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

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 ...
Separatrix's user avatar
  • 118k
35 votes

Terminology for 24 hour wake-sleep cycle on world with longer dark-light cycle?

Something to do wth circadian rhythm. I'd use circads. Alternatively, something to do with biological oscillations. Alternatively, something to do with blood pressure (or other medical metric) ...
SFWriter's user avatar
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33 votes

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

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 ...
Rubio's user avatar
  • 449
33 votes

How do you tell time on a world with 9-year days?

For Months/Seasons: The terrain. Presumably they will be in the same place every nine years, and they know where they are relative to the cycle. You'd get the Month of the Great Salt Lake and so ...
amflare's user avatar
  • 1,343
30 votes

Could We See a Lagrange Giant in the Sky?

VERY visible The giant planet would be at the L4 or L5 Lagrange "trojan" point of Earth around the sun. Or, more accurately, Earth would be in the giant planet's L4 or L5 Trojan point. ...
PcMan's user avatar
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29 votes

How long would humanity survive if a sudden eternal night occurs?

Frame Challenge I believe you're asking the wrong question. Your vampires are smart enough to know that humans need food to survive and nearly all human food depends on sunlight. Take away the sun and ...
JBH's user avatar
  • 125k
28 votes

If Earth had a smaller radius, but was rotating at the same speed, would its day be shorter?

The length of the day is strictly a function of the time earth takes to rotate. If your planet takes 24 hours to rotate then regardless of its radius, it will have a 24 hour day. You can develop an ...
sphennings's user avatar
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27 votes

How does a migratory species farm?

On a planet with a 9-year day/night cycle, some plants will adapt to that cycle. They will lay down roots in the day cycle, and then die off for four and a half years, only to spring back to life when ...
kingledion's user avatar
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27 votes
Accepted

How does a migratory species farm?

If an entire race of sapient creatures are moving, they need to take their animals, clothes, tools, houses with them. Their settlements are nomadic caravans, and the few times they get ahead of the ...
Mindwin Remember Monica's user avatar
25 votes
Accepted

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

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 ...
Zxyrra's user avatar
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25 votes
Accepted

Is it plausible for a world without an external universe to develop a year system?

Frame Challenge: Why do you need a year / calendar system? Perhaps your people don't care about time? What are they measuring time for? Aron says that for us: The calendar was invented due to the ...
Malady's user avatar
  • 4,476
24 votes

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

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 ...
Thom Blair III's user avatar
23 votes

On a world where everyone is nomadic, how does civilization start?

Your inhabitants could be following big herds of animals, migrating in the same way they do. If the animals are big, you basically have familiar clans joining to hunt them. Soon, they snatch a few ...
Alberto Yagos's user avatar
23 votes

Possible explanations for abnormal day/night cycle?

One possibility is with a highly eccentric (elliptical) orbit, plus axial tilt. The orbits of the planets are mostly circular, so the periods of constant night at the poles are roughly equal to the ...
10762409's user avatar
  • 341
20 votes

Terminology for 24 hour wake-sleep cycle on world with longer dark-light cycle?

NASA does already face this problem with its Mars rovers (since both visibility and power from solar panels require daylight): https://en.wikipedia.org/wiki/Timekeeping_on_Mars Full sunrise-to-...
Bald Bear's user avatar
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20 votes
Accepted

What would days and nights look like on this cylindrical world?

Let me start with the additional problems that arise: The trajectory of the suns is not stable. If they are slightly off-center, gravity will pull them towards the side of the cylinder that they're ...
mic_e's user avatar
  • 416
19 votes

How long would humanity survive if a sudden eternal night occurs?

Two to five years. Most of the population would likely die very quickly from the colder weather and the lack of food. Some nations would likely have a year or two of food stored. War and seizing the ...
Nepene Nep's user avatar
18 votes

Is it plausible for a world without an external universe to develop a year system?

You ask if it is plausible to develop the concept of a year. Calendars were made because there's a need to keep track of time due to argicultral, astronomical or religious reasons. As you said in your ...
KC Wong's user avatar
  • 410
17 votes
Accepted

On a world where everyone is nomadic, how does civilization start?

The earliest civilizations started in great river valleys, like Sumer (Mesopotamia), Egypt (Nile), China (Yangtze) and India (Ganges). This was because the land near the rivers was easy to irrigate ...
Jimmery's user avatar
  • 6,081
16 votes

How do you tell time on a world with 9-year days?

Does/can the planet have a moon? If it had several small fast moons like Mars, then that's a perfect external reference point. For instance, Phobos has an 8 hour orbit, and Deimos has a 30 hour ...
AndyD273's user avatar
  • 34.7k
16 votes

How do I calculate the hours of daylight on an arbitrary planet for a given day at a given latitude?

A graphical method Sometimes a graphical method may be easier to understand and remember. One year is the time required for the planet to complete one full orbit around its primary. You decide how ...
AlexP's user avatar
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15 votes

Would a species that migrates across the globe discover its roundness sooner?

If we put aside the "mythology" on the flat earth believer of ancient times, we can see that the awareness of the planet being round was well spread even before circumnavigation was possible: ...
L.Dutch's user avatar
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15 votes
Accepted

Could I have an earth-like planet from which sun and moon would never be simultaneously visible?

Decrease the brightness of your moon, and make it invisible during the day. By making the surface of your moon darker, you reduce its brightness due to light reflection (albedo). Cover it with black ...
Ghajini's user avatar
  • 1,188
14 votes
Accepted

How long could life survive The Night?

I do not believe life could evolve under such conditions but I see no reason to think the world would need to be lifeless. Plants. There are two survival options here: We have a very common class ...
Loren Pechtel's user avatar
14 votes

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

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 ...
Lostinfrance's user avatar
  • 9,304
14 votes
Accepted

Why would it be unfortunate for a day length to vary in a planet; other than that Java API developers need to work a few hours more?

Actually, I'd argue the opposite; it would be unfortunate in the long term (in geological scales) for life if the length of a day wasn't lengthening. The primary reason why the length of the day is ...
Tim B   II's user avatar
  • 54.1k
14 votes

I want ten Earth-years long day on my planet. Can I have it?

Tidal locking is a process. A process that comes to an end within finite time, but still a process. As such, any fully tidally locked body must have gone through a period of one rotation relative to ...
cmaster - reinstate monica's user avatar

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