Questions tagged [day-night]

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

Filter by
Sorted by
Tagged with
4
votes
2answers
75 views

How could a planet with a long day-night cycle naturally regulate its temperatures to allow life?

So, my planet has (around) an Earth year long day-night cycle. How could its temperatures not reach extremes that would disallow life? Assume that everything is Earth like except for multiple moons (...
3
votes
2answers
471 views

Temperatures of a planet with 1,000 Earth day long day-night cycle

My planet is Earth like in size (I can change it, if needed), however its day-night cycle is somewhere around 1,000 Earth days long. How hot would day get, and how cold would night get? Is it possible ...
1
vote
0answers
86 views

How Bright Would the Sky on This Alternate Earth Be? The Sequel to “The 372-Day Calendar”

Long ago, I asked how far Earth would orbit the sun if one year lasts 372 days instead of 365 and how much it'd affect the overall brightness. What I got was that Earth with a 372-day calendar would ...
1
vote
2answers
199 views

How Bright Would Super Saturn's Rings Be in Our Sky?

It's not that long ago that we have found the "exoplanet" J1407b, notable for having a ring system 200 times the size of Saturn's. I airquote that term because, at a mass ten to forty times ...
1
vote
1answer
33 views

Animals, plants, and sleep cycles on a moon with a very long day-night cycle [closed]

Let’s say that this moon is about the size of Earth. Let’s say that our moon has a very long day-night cycle; about an Earth year. During night, would all plantlife die because of the lack of light? ...
6
votes
8answers
311 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 ...
2
votes
0answers
53 views

How long would daytime and nightime be on a planet with a 26 hours rotational period? [duplicate]

The basics about the planet in question: As the second planet in the star system, it's somewhat warmer than Earth is. The rotational period is 26 hours and the orbital period is 312 days which ...
1
vote
2answers
103 views

Would this sort of climate be possible on a tidally locked moon? [duplicate]

In the current fantasy novel I'm working on, I decided that I wanted to have a part of the planet where it was always daylight. After doing some research I learnt about the concept of tidally locked ...
10
votes
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 ...
19
votes
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 ...
3
votes
2answers
44 views

Frequent Solar Eclipse Cycle and Its Effects [closed]

I’m trying to imagine a sci-fi/fantasy world in which a solar eclipse occurs roughly once every 3 or 4 days. The exact frequency can be arbitrary and varied, but it does need to occur often. I would ...
22
votes
6answers
1k 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 ...
5
votes
1answer
183 views

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), and ...
2
votes
3answers
115 views

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 week ...
4
votes
2answers
81 views

Alien Speices with extreme day/night cycle

I am creating this alien species and they live on three separate worlds blah blah, that doesn't matter right now. This one planet I have has a fairly long day-night cycle (I haven't decided on how ...
5
votes
2answers
171 views

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 this ...
7
votes
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 ...
4
votes
1answer
157 views

Days and Seasons via Daily Eclipses in a Flat World

While working on the cosmos of a flat world, I came upon the idea of using a dim sum rotating about an axis through the central pole (as described here) in order to accomplish days and seasons. The ...
4
votes
2answers
251 views

Sleeping in a world without night

I'm working on a game world where light (Lux) gives literal definition to all matter. Anything in complete shadow (Umbra) is without definition and completely amorphous. At the center of the world, ...
7
votes
7answers
301 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 ...
8
votes
2answers
333 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. ...
4
votes
3answers
253 views

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. I'd ...
6
votes
7answers
880 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 ...
5
votes
4answers
334 views

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 words,...
2
votes
1answer
127 views

Seasons & days with steep axial tilt?

Given tilt of about 90deg (like Uranus), with day & year like Venus (day longer than year), orbiting a purple (brown) dwarf (not tidal locked). I'm having trouble getting "seasons" & day ...
2
votes
6answers
242 views

Would separating people into 2 groups help the economy in any way?

Would splitting humans into two groups, those that work and live during the night, and those that work and live during the day, help the economy in any way? What would be other considerations of ...
5
votes
3answers
303 views

What is the optimal sleep scheduling strategies for a 24h sleep cycle on a 48h day planet?

I have a planet with days that is exactly two times longer than in real world. I'm trying to find out the best time to sleep if people still need as much sleep as they do even if they are on a planet ...
4
votes
2answers
148 views

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 lasts ...
10
votes
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 ...
9
votes
1answer
903 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 ...
6
votes
5answers
850 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 ...
6
votes
2answers
220 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 ...
3
votes
4answers
230 views

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 ...
17
votes
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 ...
7
votes
3answers
294 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 ...
5
votes
6answers
306 views

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 Is ...
5
votes
5answers
243 views

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 ...
2
votes
3answers
150 views

How would the people survive in darkness and be affected by the short periods of sunlight?

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. Similar to earth the ...
8
votes
4answers
417 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. ...
3
votes
3answers
200 views

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, ...
2
votes
1answer
158 views

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
vote
1answer
583 views

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 ...
8
votes
7answers
986 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-...
4
votes
1answer
420 views

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 planet ...
9
votes
4answers
2k 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 ...
1
vote
0answers
103 views

Night/Day Cycle Magic [closed]

How would a world evolve where magic users can either only use magic when the moon is up, or only when the sun is up. How would this effect where magic users live, and how would they interact with the ...
19
votes
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 ...
5
votes
1answer
189 views

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 ...
7
votes
4answers
437 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/...
5
votes
1answer
118 views

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, avoiding a ...