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Q&A

Posts tagged day-night

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Q&A 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 cavit...

4 answers  ·  posted 2y ago by Yuriy S‭  ·  last activity 2y ago by Yuriy S‭

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Q&A 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 hav...

6 answers  ·  posted 2y ago by Zjerzy‭  ·  last activity 2y ago by Zjerzy‭

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Q&A 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 a...

6 answers  ·  posted 3y ago by The Quivering Frond of Destiny‭  ·  last activity 3y ago by The Quivering Frond of Destiny‭

Question planets day-night
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Q&A Under which circumstances could a planet have two visible suns?

In the story I'm making, it is important that there are two suns in the sky, going at different rythms (maybe the planet orbits one of them each year, and the other each four years, for instance), ...

1 answer  ·  posted 3y ago by Iván Flores Vázquez‭  ·  last activity 3y ago by Iván Flores Vázquez‭

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Q&A 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 Tita...

1 answer  ·  posted 7y ago by JohnWDailey‭  ·  last activity 3y ago by JohnWDailey‭

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Q&A Could a planet have a week long day and a week long night depending on the season?

Essentially I'm looking for a plausible way that a planet could have odd, extreme seasons. Basically I'm wondering how (or if) a planet could work that has a week long day during the summer and a w...

3 answers  ·  posted 3y ago by Shawn‭  ·  last activity 3y ago by Shawn‭

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Q&A 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 ...

9 answers  ·  posted 3y ago by Aceharmsway‭  ·  last activity 3y ago by Aceharmsway‭

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Q&A Creating "Sunfall" on the moon of a gas giant

I'm attempting to figure out the orbital physics of a system that has a habitable body that has intense periods of waxing and waning sunlight. I've come to the assumption that the best body for thi...

2 answers  ·  posted 3y ago by Nymn‭  ·  last activity 3y ago by Nymn‭

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Q&A Sleep Cycles on very fast and very slow rotating worlds Part 1

Related previous question. How would sleep cycles work on planets with day-night cycles greater than 48 hours or less than 6 hours? This part is primarily for wildlife that evolved there. Native ...

1 answer  ·  posted 3y ago by Aezyc‭  ·  last activity 3y ago by Aezyc‭

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Q&A Does day length determine metabolism?

Would an organism that evolved on a world with a short day length have a faster metabolism in comparison to one that evolved on a slower rotating world?

1 answer  ·  posted 3y ago by Aezyc‭  ·  last activity 3y ago by Aezyc‭

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Q&A Can a planet with a very long day/night harbor life such as Earth?

The year of this planet is 1,000 earth-days-long around its star, and its night lasts half a year. Can it support life such as Earth? With humans and lush forests and liquid water and good tempe...

2 answers  ·  posted 5y ago by Maxwell‭  ·  last activity 3y ago by Maxwell‭

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Q&A 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...

2 answers  ·  posted 3y ago by JohnWDailey‭  ·  last activity 3y ago by JohnWDailey‭

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Q&A How could I scientifically explain a world with day/night cycle only on the equator?

I'd like to build a world that has one pole where it's constantly day (all year long) and the weather is very hot, and one where it's constantly night (all year long) and the weather is freezing. ...

3 answers  ·  posted 3y ago by Mr_Bober‭  ·  last activity 3y ago by Mr_Bober‭

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Q&A Effect of 32 hour days?

What would the effect on humans be of a 32 hour day rather than 24 hours? It would be a pretty much even split of 16 hour days, 16 hour nights. The people would have previously been on a spaceship ...

5 answers  ·  posted 6y ago by The Fisher King‭  ·  last activity 3y ago by The Fisher King‭

Question day-night sleep
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Q&A 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...

7 answers  ·  posted 3y ago by SealBoi‭  ·  last activity 3y ago by SealBoi‭

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Q&A Could a Stanford torus rotate on an additional axis to give it a diurnal cycle?

Suppose you have a regular old Stanford torus space station with a 'glass ceiling' rotating at 1.3 RPM. Put it in orbit around a star such that its axis of rotation intersects the star (in other wo...

4 answers  ·  posted 3y ago by T3db0t‭  ·  last activity 3y ago by T3db0t‭

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Q&A Seasons & days with steep axial tilt?

Given tilt of about 90deg (like Uranus), with day &amp; year like Venus (day longer than year), orbiting a purple (brown) dwarf (not tidal locked). I'm having trouble getting "seasons" &amp; day le...

1 answer  ·  posted 3y ago by vulcanforger‭  ·  last activity 3y ago by vulcanforger‭

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Q&A Is it safe to have an earth-like temperature for a 48-hour day-night cycle on a big planet?

I want this planet to be very earth-like on all aspects except for its size and the day-night cycle. The circumference is three times greater than the earth's circumference. The day-night cycle las...

2 answers  ·  posted 3y ago by brendt‭  ·  last activity 3y ago by brendt‭

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Q&A 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 ...

5 answers  ·  posted 4y ago by Firelocke‭  ·  last activity 3y ago by Firelocke‭

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Q&A 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/s...

4 answers  ·  posted 5y ago by C. Waldo‭  ·  last activity 4y ago by C. Waldo‭

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Q&A 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-spa...

1 answer  ·  posted 4y ago by ΓΙΑΝΝΗΣ ΜΙΧΑΗΛΙΔΗΣ‭  ·  last activity 4y ago by ΓΙΑΝΝΗΣ ΜΙΧΑΗΛΙΔΗΣ‭

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Q&A 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 k...

2 answers  ·  posted 4y ago by SKKennell‭  ·  last activity 4y ago by SKKennell‭

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Q&A Day/night cycle science help?

So I am building a world but need help with its day/night cycle and the science to make it work. The planet has a 32 hours day cycle, however there is only 10 hours of light a day. This planet is...

4 answers  ·  posted 4y ago by Scarzie‭  ·  last activity 4y ago by Scarzie‭

Question space day-night
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Q&A How would a 384 hour day/night cycle on a desert planet affect the weather?

The planet has a slow rotation around its axis, taking 384 hours for a full day and night cycle at the equator. There is one large continent which takes up around one third of the planets surface. ...

1 answer  ·  posted 4y ago by sevvack‭  ·  last activity 4y ago by sevvack‭

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Q&A 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 &amp; I'm wondering what effects this will have on its surface and climate. Also, I don't know if this is r...

3 answers  ·  posted 4y ago by Kowita‭  ·  last activity 4y ago by Kowita‭

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Q&A 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...

7 answers  ·  posted 4y ago by DerGreif‭  ·  last activity 4y ago by DerGreif‭

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Q&A How would plants survive an extremely long, cold night

On my planet, the whole day lasts nine years. The day lasts 4.5 years of incredible heat, with glaciers from the night providing water. The night starts with the sunset, during which violent tornad...

6 answers  ·  posted 6y ago by Uncle Tres‭  ·  last activity 4y ago by Uncle Tres‭

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Q&A What sort of setup of a binary star system would allow only one sun to be "up" at a time?

I have a sci-fi/fantasy world with two suns. Only one sun can be present in the sky at a time. A full day-night cycle would be: Night time Sun 1 rises Sun 1 sets Sun 2 rises Sun 2 sets Night time...

6 answers  ·  posted 4y ago by Discant‭  ·  last activity 4y ago by Discant‭

Question astronomy day-night
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Q&A A planetary region with no night and no tidal locking?

Without tidal locking, would it be possible to have a planet with a region roughly the shape and size of the USA and Canada in which it is always "day"? (By day I mean at least as bright as a clear...

5 answers  ·  posted 4y ago by Xandar The Zenon‭  ·  last activity 4y ago by Xandar The Zenon‭

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Q&A 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....

4 answers  ·  posted 4y ago by Celgiek‭  ·  last activity 4y ago by Celgiek‭

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Q&A How thick does an atmosphere have to be in order to make the sky "light up" during "daytime" human or near human ocular sensitivity?

If a planet were to have a very thin atmosphere how thick or thin would it have to be to allow there to be a daytime and a nighttime given human or near human ocular sensitivity? In other words, ...

3 answers  ·  posted 4y ago by ylluminate‭  ·  last activity 4y ago by ylluminate‭

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Q&A How would the length of a day-night cycle affect a planet's climate?

I am envisioning a habitable world with an atmosphere comparable to earth's in which one day is extremely long (&gt;100 earth years). Human settlers have successfully colonized a small portion of t...

2 answers  ·  posted 4y ago by Gabe L‭  ·  last activity 4y ago by Gabe L‭

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Q&A What if Jupiter's rotational period was equal to that of the Earth?

I was amazed when I learned that Jupiter rotates on its axis once in only 9.8 Earth hours. (Yes, you can call me uneducated!) What if the rotation period was 24 Earth hours? What would change in th...

1 answer  ·  posted 8y ago by ballah‭  ·  last activity 4y ago by ballah‭

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Q&A A K-Type Binary Dawn/Dusk in the Equator

In this alternate scenario, Earth is the third planet in a binary star system. One star is a K-type main sequence star--or "orange dwarf"--that has 80% the mass of a G-type main sequence star--or ...

1 answer  ·  posted 4y ago by JohnWDailey‭  ·  last activity 4y ago by JohnWDailey‭

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Q&A Earth Orbits a K-Type Star. What Would the Visual Scenery Look Like?

To clarify on the title, K-type main-sequence stars--shortened as "orange dwarves"--are subjects of excitement for astronomers and astrobiologists. Why? They emit enough radiation to provide a...

1 answer  ·  posted 4y ago by JohnWDailey‭  ·  last activity 4y ago by JohnWDailey‭

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Q&A How does the day/night cycle work on a non-tidally locked moon?

So to keep this simple, imagine a planet much like ours, orbiting a star. For the sake of this example, let's give the planet a 24 hour rotation, and a 364 day orbit around the star. Now, this pla...

1 answer  ·  posted 4y ago by fiend‭  ·  last activity 4y ago by fiend‭

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Q&A 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 ...

4 answers  ·  posted 6y ago by The Spartan‭  ·  last activity 4y ago by The Spartan‭

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Q&A 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 wo...

13 answers  ·  posted 5y ago by Pasqueflower‭  ·  last activity 5y ago by Pasqueflower‭

Question moons day-night
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Q&A What would the temperature variation be on this planet? (High eccentricity & slow rotation)

I've been trying to figure out a model (or find a relevant paper) for calculating the approximate day/night and periapsis/apoapsis temperature variation for an earth-like planet that has a high ecc...

1 answer  ·  posted 5y ago by n_bandit‭  ·  last activity 5y ago by n_bandit‭

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Q&A Climate on a world with a Sun of varying luminosity

Given the daylight cycle discussed here (see the graph in the selected answer), suppose that the moon revolves in the equatorial plane, at a distance sufficient to light (barely) the poles, avoidin...

1 answer  ·  posted 5y ago by Francesco Manzali‭  ·  last activity 5y ago by Francesco Manzali‭

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Q&A 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...

3 answers  ·  posted 5y ago by cain jenkins‭  ·  last activity 5y ago by cain jenkins‭

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Q&A Feasibility and challenges of a kingdom existing within an eternal night?

Okay, so admittedly I was going for a title that was a bit more catchy than the actual question, but not by much. On a technical level, the real question is "Feasibility and challenges of why a la...

7 answers  ·  posted 5y ago by JustSnilloc‭  ·  last activity 5y ago by JustSnilloc‭

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Q&A 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 deser...

14 answers  ·  posted 6y ago by Uncle Tres‭  ·  last activity 5y ago by Uncle Tres‭

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Q&A Human colony on distant planet system with very short day-night cycles

I need a planet where the day cycle is short, in particular 16 hours. I read What determines the length of a day on a planet? and Is it physically possible for a planet to have seasons of different...

3 answers  ·  posted 5y ago by adonies‭  ·  last activity 5y ago by adonies‭

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Q&A What is the optimal circadian rhythm?

We have 24 hour schedules because the earth rotates about once every 24 hours. But what if humans were on a planet that didn't have 24 hour days? Would their bodies adapt to stay awake for far long...

3 answers  ·  posted 5y ago by Iter‭  ·  last activity 5y ago by Iter‭

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Q&A What temperatures could I expect to find on a world with a 9 year day?

I am working on a world where, instead of 24 hours, a day lasts 9 years. On this world the land far exceeds the oceans, to the point where the bodies of water are simply massive lakes (a la the Cas...

2 answers  ·  posted 5y ago by Uncle Tres‭  ·  last activity 5y ago by Uncle Tres‭

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Q&A Could a habitable tidally locked planet have a day and night cycle caused by the eccentricity of its orbit?

I'm trying to think of ways that a habitable tidally locked planet could have something that resembles a day/night cycle. Shadows caused by any moons being out of the question. Hypothetically, cou...

4 answers  ·  posted 5y ago by Noble‭  ·  last activity 5y ago by Noble‭

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Q&A 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 m...

3 answers  ·  posted 5y ago by BambooBandit‭  ·  last activity 5y ago by BambooBandit‭

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Q&A 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 24...

4 answers  ·  posted 7y ago by Monica Cellio‭  ·  last activity 5y ago by Monica Cellio‭

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Q&A Sun/stars orbit and climate

I understand this is a broad topic that to a degree was answered in previous questions. What I'm trying to do is to create a plugin in Unreal 4. I'll start by creating a day/night system and a sk...

2 answers  ·  posted 5y ago by Alexander Styliaras‭  ·  last activity 5y ago by Alexander Styliaras‭