Questions tagged [time]

For questions about the standard passage of time on objects/people/civilisations etc. Also consider the [time-keeping], [spacetime-dimensions], [alternate-history], [universe], [time-travel], or [time-manipulation] tags.

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0answers
41 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 ...
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3answers
122 views

Can a person step into a time rip and age rapidly without their clothing aging? [closed]

I have a character who has pierced the dimensional membrane (that’s what I’m calling it) around our universe/world seeking a new form of energy. In the process he created time bursts—-quick flashes of ...
189
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23answers
22k views

How might modern humans leave a message for 50,000 years?

I recently played my way through the Mass Effect game series, and one of the ideas I found most intriguing was the emphasis placed on "time capsules" sent from one cycle to the next: not only did ...
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4answers
157 views

How long would it take to make three hundred spaceships and an orbital defense system? [closed]

I'm about halfway through a story I'm writing, where aliens invade, beat us up, one spaceship blows them all up, etc, etc, and everyone lives happily ever after. Except they don't. So after they chase ...
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10answers
405 views

What would the most peculiar characteristics of a “time fly” be?

One of the syntactical interpretation of the famous linguistics sentence "Time flies like an arrow." is to consider "time flies" as a noun phrase. This makes "time flies" analogous to "fruit flies". ...
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2answers
138 views

How long could late medieval-like architecture survive without humans to maintain it while they were in a magical sleep?

I'm bouncing ideas around in my head for the story for a game I'm planning. I wanted the world to be one where humanity was re-emerging from a magical slumber and setting out to reclaim the world. ...
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1answer
86 views

A Good Gift for a Medieval Worker? [closed]

I'm a time traveller, and on my last trip back to the 1300s I befriended several of the locals. One is a fairly wealthy farmer, and the other is the village blacksmith. Now, since they helped me when ...
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3answers
524 views

Can a planet's moon rise at the same time every night?

Is it possible for a planet's moon to always rise at the same time of the night? And in this way be used as a timekeeping device? What if there are two moons?
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2answers
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Tidally locked time keeping 2 [duplicate]

I have done some research and so much contradict one another or I simply fail to understand. Can a moon be used as accurate time keeping and is it possible for it to revolve around the planet once an ...
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15answers
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Could agriculture still be developed by intelligent species that lack the concept of past and future?

Imagine somewhere in the universe there is an intelligent species that is as intelligent as our stone age fore-brothers and sisters but will never establish the concept of past and future events. ...
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2answers
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Durability of materials in ideal conditions

How long can objects made of hard material last at room temperature in otherwise ideal conditions? If left outdoors on Earth, over the course of millions of years, any material will be eroded by wind,...
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29answers
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I'm stranded on an alien planet. How do I measure an earth year without a clock?

I just got shoved through a stargate onto a planet I don't know. I was told the gate would open again in exactly one Earth year. I wasn't carrying anything; I don't even have my watch. How do I know ...
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1answer
99 views

A new type of paradox? [closed]

Imagine we had this incredibly powerful computer that can simulate our universe, and that we somehow knew the initial conditions of the big bang (or the planet earth) down to the exact detail. Fast ...
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1answer
95 views

Civilization going backwards. How to? [closed]

When we talk about civilization rollback, it's usually some kind of post nuclear war scenario, where everything is in ruins but the knowledge isn't lost. After some huge catastrophe, we'll still have ...
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1answer
75 views

How do I calculate the total time dilation experienced by an accelerating ship?

My advanced human civilisation often has high-acceleration ships travelling at near lightspeed. I know that time dilation would have a significant effect on the time experienced by the crews, but I've ...
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9answers
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Would a single solar system be able to come up with a main time system?

I have a solar system containing multiple planets, most having an intelligent species inhabiting it. To keep a common peace, they created a large government system to help stop territorial wars ...
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7answers
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Could written documents last for 3 million years?

This is another question about my fantasy version of Pluto. Basically, I’d like the Plutonian’s civilization to be at least 3 million years old, and there are written documents from when their ...
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6answers
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How old are people from several worlds? [closed]

In an universe with several worlds, how would people from different planets define their age in a way that everyone use the same basis ? Different species have different lifespan, like humans up to ...
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10answers
467 views

A Nonlethal Time Dilation Field

I want a way to enclose an area (building-sized and on Earth, let's say) in a field that warps spacetime so that time appears to pass 100x slower within it. You don't need to explain how the field got ...
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1answer
197 views

how would a Black-Mesa-like research complex fare after 500 years of abandonment [closed]

So, take Black Mesa from Half Life. What would it look like after 500 years of abandonment? (assuming the events of half life have not occured) For this scenarios there are no looters or humans ...
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5answers
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Travel time in Medieval times

I have a character who lives on the outskirts of a large empire and he has to travel to the capital. By horseback, how far could my character realistically travel in a day? How far could he travel in ...
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10answers
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How much would a language change over 500 years completely cut off from its source?

In the lore for the book I'm working on, what basically happens is a ship full of Byzantines is expelled from their homeland on a ship and winds up on a small continent (think something around the ...
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2answers
91 views

Tracking time between multiple different realities simultaneously

How do I track time (using a special time system) between two realities that are not necessarily parallel but if a person jumps from one to the other what would the time be in comparison to their ...
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3answers
267 views

How to get time to pass faster on another planet compared to earth?

I'm developing a story where humans colonize a few planets. One planet, lets call it Planet A, has similar gravity to earth, air pressure, and solar radiation. You cannot however, walk on the surface ...
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3answers
212 views

Time Traveler's Paradox Prevention Guidelines

I'm running a mysterious, shadowy, acronym-lettered agency which deploys agents all across the world (and beyond) to deal with supernatural and paranormal events. What they encounter is often ...
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3answers
172 views

Reason/Mechanism for seemingly randomly lengthened lifespans in characters in a roughly viking-age world [closed]

So here's the deal. I'm working with the idea that in my world, people can have very different lifespans. Most people live a normal lifespan - the book is set in a fantasy world roughly equivalent to ...
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4answers
223 views

What would it take to make a scientific second equal exactly one traditional second?

A scientist is resetting the clock on his microwave one day as he considers the hopelessness of keeping the time exactly right. Not for the reasons we worry about like power outages and daylight ...
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3answers
102 views

How long/in what condition would a corpse last in a totally irradiated, unsealed environment?

My setting takes place in a post-apocalyptic america, and is in many ways a classic 'great war ends world' sort of thing. However, the cataclysmic ending to most of the country is persistent, lethal ...
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1answer
53 views

Would time dilation alter apparent mass observed from outside time dilation zone?

A familiar scenario in scifi: a bubble of space is isolated artificially from the outside world by means of time dilation: time inside the bubble moves more slowly than time outside it. Assume that ...
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4answers
569 views

How could a volcanic island last for 100 million years?

Some islands can survive for very long. Madagascar, for example, has been around for 80-100 million years and is likely to remain isolated for hundreds of millions of years more. Volcanic islands, ...
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2answers
107 views

Time in relation to life in the Jovian System

I'd just like to preface this with the fact that I'm super new and I apologise if this has been discussed in some way previously (I have looked at similar topics but they haven't quite given me the ...
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3answers
165 views

What would a suitable measurement for time be that can be used universally? [duplicate]

I have recently been trying to come up with a measurement of time, such as years, seconds, etc, that can be used irrespectively of galactic location and universe location. Star-treks stardate was ...
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8answers
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How would a medieval person notice that they've traveled back in time?

How would a Renaissance-era shopkeeper, in a walled and paved city, notice that they've traveled back in time, right when they wake up, or soon after, like after 5 min and looking outside? No dead ...
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19answers
9k views

Is it possible to encode a message in such a way that can only be read by someone or something capable of seeing into the very near future?

Say you have some way of seeing somewhere between a microsecond to 0.1 seconds into the future, or at least the most likely future. Is it possible,through something like a flip-book effect or some ...
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2answers
360 views

How much is it possible to fake age? [closed]

There's a society with a privileged class of people. Privileged - because the period of time when they can be part of that class is limited. Only people between 20 and 30 years old can be admitted and ...
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2answers
536 views

What would be left of a modern city 50,000 years from now?

I've seen questions here about what cities would be like after being abandoned for a thousand years, but what would be left after timescales of tens of thousands of years? Ancient settlements like ...
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0answers
156 views

I'm inventing a new calendar. What are good criteria for the choices of first day, first year, and first hour? [closed]

I'm inventing a new calendar: It will be used worldwide. It uses an intercalary (366th) day to be inserted every 4 years. If extremely successful (unlikely I know), it will replace the Gregorian ...
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0answers
119 views

Can you mine bitcoins or other data a time loop? [closed]

You have your own time loop. For one day only: at midnight, if you choose, you can transport your mind back 24 hours and relive the day, but with all the memories you have gained. Nobody else will be ...
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1answer
120 views

Speed of light, Motionlessness, and Time Travel [closed]

i want to ask something I quote from some web and got this : 'According to Einstein’s Special Relativity Theory, time is affected by speed. It’s already been proven in the lab that subatomic ...
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1answer
893 views

How would stopped time look from the outside?

If there were a sphere or a cube where time is stopped, how would someone passing by perceive that? I have something in mind that stops everything, including air and light, not only solid matter. My ...
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5answers
2k views

What's the most convenient time of year in the USA to end the world?

This is a question I've been wondering about for a while. If I wanted to give my characters the best possible chance of surviving my story's Armageddon, what time of year should I schedule it for? ...
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4answers
209 views

Could a planet with two time streams be possible

I am asking specifically because I was recently doing a Doctor Who marathon and saw the apalapucia episode and thought "I wonder if that's possible?" So here I am. Is it possible to have a planet ...
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33answers
5k views

On a tidally locked planet, would time be quantized? [closed]

Assume a planet that always presents one side to the sun. No moons. The orbit of the planet around the star is essentially spherical, very minor and undetectable aberrations. The orbital period of the ...
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7answers
2k views

On a planet without seasons, how would people track years?

On a planet without axial tilt and with a roughly circular orbit, there would be no seasons. The climate on the planet would be, as far as I can tell, exactly the same at any time of year, and the ...
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2answers
163 views

Year with 13 months [closed]

Would it be possible to convince the world to have 13 months with 28 days rather than having 12 months with different numbers of days every month? Disregarding historical reasons for our current ...
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4answers
597 views

How would a coma-like death system work on an alien world?

I'm creating a hardcore survival and simulation game on an alien planet. Plants and diseases evolve, adapt and change the environment, and you set up buildings, breed plants and create machines to ...
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27answers
12k views

How to Defeat a Precognitive Warrior? [closed]

My hapless wanderer (let's call her Alice) escaped the Wold forest only to stumble upon a large, featureless and dusty plane, at the center of which lies Castle Morrow, a fort populated by mechanical ...
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4answers
984 views

Santa is a time traveller. How does he not violate causality?

People wonder how Santa can deliver all his presents in one night. It's, simple: he's a master time traveller. (This post will form the base of a long series of questions). Here's how Santa's usual ...
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5answers
2k views

Are there any software tools available to map the solar system hundreds of years from now?

I am writing a scifi novel based roughly four hundred years from now, and it occurred to me that the planets and other objects might not be quite where I need them to be for certain travel details to ...
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3answers
353 views

How plausible is a civilization, or life, that perceives time in reverse?

Humanity, with modern science, has established that the Big Bang happened 13.8 billion years ago. The universe appeared in a low-entropy state, and for billions of years has been expanding and moving ...

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