Questions tagged [day-night]

For questions regarding the day-night cycle of a day on a world. Usually regarding the dark-light cycle.

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67
votes
14answers
11k views

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

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 ...
42
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16answers
9k views

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

On my world, the day lasts 9 years: 4.5 years of light, followed by 4.5 years of dark. The inhabitants of this world survive by migrating along the ring of dusk and dawn. How do these people tell ...
27
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14answers
4k views

How does a migratory species farm?

On a world I am building, the day and night cycle lasts 9 years, resulting in the majority of animals migrate across the planet. One of the problems that my sapient races (one on the out going night ...
27
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16answers
6k views

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

As previously stated, I am constructing a world that has a day lasting nine years. The inhabitants must always be on the move in order to avoid the freezing wastelands of the night, but not so fast as ...
22
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13answers
3k views

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

Take the Jovian moon Ganymede as a real-world example. It has an orbital period of ~7 days around Jupiter, which is effectively its day and its year simultaneously. My characters will need the words ...
22
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6answers
2k views

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

I want to be able to graph the change in daylight hours across the year for a given latitude, to get an idea of what kind of cycle in available daylight people at that latitude would live through and ...
19
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6answers
3k views

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

I need ten Earth years long day-night cycle on my planet. Hemera is a world I am creating as a setting for my story. Name comes from Greek deity - personification of Day. Needs of storytelling have ...
17
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8answers
5k views

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? [closed]

Quoting from the Java Docs: Unfortunately, as the Earth rotates the length of the day varies. In addition, over time the average length of the day is getting longer as the Earth slows. I am ...
16
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6answers
8k views

Could it be possible to be near-blind in daylight yet see perfectly at night?

The question is fairly straightforward but to put a bit of context: (Slice of life): I've often noticed how even though my eyesight really isn't great* I still somehow manage seeing a lot better at ...
16
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5answers
5k views

Would a human individual adapt to a change in the day-night cycle?

I'm thinking on the colonizing of another planet by humans. The conditions of this planet are quite different from Earth, and particularly the day-night cycle is much larger. In my fictional planet, ...
16
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1answer
750 views

Stabilizing the Temperature On a Planet With a (Very) Long Day

Let's say my terrestrial planet has a stable circumbinary orbit around two suns similar to the Kepler-47 system, in the habitable zone, with an orbit similar to Kepler-47c. The challenge here is that ...
14
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5answers
3k views

Could We See a Lagrange Giant in the Sky?

The "Lagrange giant" in the title refers to a gas giant that orbits its star in the same distance as Earth does. The alternative description is "Trojan planet" or, to be most ...
12
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2answers
1k views

Day and night temperature on an Earth-like planet with longer rotational period

DISCLAIMER: This question was closed on Astronomy Stack Exchange as off topic, so I'll try my luck here. I'm trying to understand the climatic effects of the far future scenario of an Earth-like ...
10
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9answers
2k views

How long could life survive The Night?

The Problem In a world I am building, the days are 9 years long, this means 4 and half years of cold darkness following 4 and a half years of blistering daylight. I have asked questions on this Year ...
10
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4answers
899 views

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

I have a world with 9 year days. That is, the day-night cycle here lasts 9 years, where ours lasts a mere 24 hours. Very similar to a tidally locked planet, except the habitable belt moves. The ...
10
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4answers
2k views

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

This is yet another "literal worldbuilding" question, as in, building worlds. Inspired, in part, by this question. What if this world is a very long (effectively infinite) hollow cylindrical cavity ...
10
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4answers
2k views

Ways other than sleep to restore cells/neurons

So I have a planet with multiple species on it. My planet is tidally locked. I know it is generally thought a tidally locked planet couldn't harbor life because of the extreme temperatures, but my ...
10
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4answers
2k views

How would humans be affected by a 12-hour day?

In Can I significantly shorten the days on a planet that can support human life? I asked about changes needed to a planet to support human life with a much-shorter day (12 hours or so instead of 24ish)...
9
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7answers
806 views

Is a "sun belt" realistic?

In a few science-fiction books I've read, the world that the story takes place on doesn't have a sun, but does have a "sun belt," where (instead of a regular sun) the world is lit by a stretch of sky ...
9
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4answers
3k views

Tree growth rings without seasons

Tree growth rings are created because the time of day with sunlight differs throughout the year. How would the inside of a tree look, if it were to grow up on a planet without seasons, where day and ...
9
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2answers
3k views

World with two suns [duplicate]

I am going to create a new world for my DnD group as our next campaign setting. What I currently have in mind is a hostile desert world with scarce water sources and high temperatures. I wanted to ...
9
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5answers
2k views

A world with only sunlight and a world with no sunlight (Fantasy)

I'm curious if it's possible for human life to survive in both of the following cases: 1. A fantasy world with only sunlight (no night). 2. A fantasy world with only night (no day). Note: let's ...
9
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1answer
1k views

If the Earth was part of an ultimate solar system, what would the sky look like?

I once show a picture depicticting the idea of an ultimate solar system: Image Copyright Sean Raymond In this solar system there are 8 planetary orbits, each containing 52 equal-mass, evenly-spaced ...
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7answers
1k views

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

On earth there can be hours where the moon is up during the same time the sun is in the sky (daytime moon) due to the combined rotation of earth and orbit of the moon. I would like to have an earth-...
8
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3answers
963 views

What would weather look like on a world with a 9-year day?

In a world I am building, the planet's days are longer than its years, with a single day taking 9 years. In all other ways, this planet is similar to Earth, but are there other differences I am ...
8
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5answers
697 views

Erratic Day and Night Periods

How is it possible to have a habitable planet where there are patterns of light and dark so erratic, it almost seems random (with a leaning towards greater periods of darkness than light)? For ...
8
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2answers
425 views

Nocturnal Photosynthesis

It's a basic fact that most plants need sunlight to generate growth. Sure, they also need water and nutrients, but their reliance on sunlight is the one sole thing that separates them from animals. ...
8
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4answers
455 views

How would flora be affected by longer night than day cycle?

Night/Day Cycle I'm trying to make a fantasy world with a longer night cycle than day. With the advice of Renan, 12 hours of proper night, 4 hours of near/partial dark and 8 hours of good light. ...
8
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4answers
1k views

How would plants be affected by a 48 hour day?

How would plants be affected by a 48 hour day, instead of 24 hour? Would plants be larger to store more energy for photosynthesis? Also, how about the temperature of the earth be different on both ...
8
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2answers
269 views

What are the effects of constant daylight on plantlife

On a world I am building, the day/night cycle last 9 years, meaning that there are interesting forms of life. Plants are the most interesting of these living things, which have many interesting forms ...
8
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2answers
414 views

Seasons and Day/Night Cycles on Horseshoe Habitable Worlds?

In the latest Artifexian video, he talked about terrestrial moons, bringing up great ways they could and would exist. But the video ended with an interesting concept, Horseshoe Habitable Moons. From ...
7
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9answers
1k views

Realistic ways a Planet or Large Moon could have Variable Day/Night periods

Hello I imagine this is a pretty straightforward question, perhaps already covered in another post, but I wanted to get extra perspectives and options for achieving this type of planet or moon. So ...
7
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7answers
346 views

Always night in one hemisphere. Is it viable?

I am building a world where one side of the planet has normal progression of day and night whereas in the other hemisphere it is always night. At first I had no idea how this could be possible in the ...
7
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3answers
2k views

Season cycle that would occur on a habitable planet that orbits two suns?

If there's a habitable planet that orbits two suns like the above orbital route, what would possibly occur on that planet? Would it have two yearly seasonal cycle (compare to earth)? Would it be ...
7
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3answers
2k views

How could a planet have a 40 hour day cycle with its nights only lasting 3 hours?

In this hypothetical solar system the one habitable planet in question would be at center of two sun stars, one similar to our sun and the other a red dwarf. What kind of effect would this have on the ...
7
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3answers
323 views

Effects of 6 hours days on my planet

One of the planets I am working on is supposed to have a day of about 6 earth hours long & I’m wondering what effects this will have on its surface and climate. Also, I don’t know if this is ...
7
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5answers
1k views

What are the day and night fluctuations for a moon orbiting a planet the size of Jupiter?

In a nutshell, I'm trying to build a world with erratic day/night cycles. To get the erratic days, I'm working with a habitable moon. It takes 3 full earth days (72 hours) for the habitable moon to ...
7
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4answers
726 views

Spotlight distribution in a hollow earth?

I've been toying with a concept for a hollow/inner Earth universe in which I would like to achieve an even distribution of light. The pickle is that the "sun" of this world operates like a beacon/...
7
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2answers
457 views

Is a sudden slowing of a planet's rotation realistic?

In the world I am designing, the days last 9 years. The main problem I had was how life could have evolved on a world like this. An easy solution is to have the world start having 9 year days after ...
7
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4answers
482 views

How to explain it rains only/always when there is no daylight?

How can I explain that it only rains at night (i.e. from dusk till dawn) in a certain region? Can or must I make this meteorological phenomenon apply planet-wide? Can or must I restrict rainfall to ...
7
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3answers
399 views

Planet Tidally-Locked to its star having eclipse day/night cycles?

I'm thinking of a planet with one side too hot, and one too cold due to always facing its star. With the planet having a small ring, a "twilight zone" which may be habitable, I was wondering if a moon ...
6
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11answers
719 views

How do you achieve the agricultural revolution without agriculture?

On a world I am building, the defining feature of the world if that the days last 9 years instead of 24 hours. This means that the species' living on the world must always migrate to keep up with the ...
6
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7answers
907 views

A planet of ice and fire

I had an idea for a planet which has very hot days, roughly 40 degrees C on average, and very cold nights, average -5 degrees. These figures are subject to change. Of course, there are places which ...
6
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8answers
380 views

Could a planet with many moons see a different moon each night?

This is just an idea I have been toying with. Taking Earth as an example with 7 days in a week, my idea would that there would be 7 moons in orbit around the planet. They would not necessarily share ...
6
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3answers
2k views

Effect of longer day/night cycle on human sleeping patterns

So in a setting I'm developing, a moon orbits a gas giant once every four days. It naturally is tidally locked to the parent body. Halfway through the day part of the cycle there is a two hour solar ...
6
votes
1answer
656 views

If the Moon Titan Orbits Earth

Long ago, I made a post with a scenario on how planet Earth would be affected if our moon were the size of Mars. But I've decided that it be more reasonable if our moon were closer in size to Titan, ...
6
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2answers
207 views

If John Atkinson Grimshaw's Paintings were actually daylight, what kind of star would this "sun" be?

An Englishman by the name of John Atkinson Grimshaw was known only for his nocturnal paintings of the British landscape. I don't know about you, but his nocturnes have struck me as a bit...bright. ...
6
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2answers
244 views

2 weeks day, 2 weeks night, how would the sleeping pattern of the planet's dominant species work with a 28 'day' Day?

Okay, so I have this binary planet system. The main planet a bit bigger than earth with a size appropriate moon-planet. Both are habitable and with a humanoid species that evolved there. But, I know ...
5
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3answers
549 views

Could I make this dark and eerie world possible?

The inspiration came from the music in the title sequence of the film Alien. The idea is a planet that humans have colonized where it's almost always drizzling slightly. It's always dark but there is ...
5
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4answers
343 views

What forms of life would be best adapted to living on a world with nine year long days?

Let us suppose that instead of the 24 hour cycle we currently enjoy on Earth between day and night, we instead lived on a planet with a day/night cycle that lasted a full 9 years. The noon of the day ...