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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177
votes
21answers
21k 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 ...
37
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20answers
8k views

How would people tell time if it was always day?

So, if I have a civilization that lives in a hollow planet, with a sun in the middle. How would they tell time? The sun always shines, and it is a Constant Spring/summertime weather. They have animals ...
59
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11answers
11k views

How Would a Post-Planetary Civilization Measure Time?

Our perception of time is steeped in the rhythms of our world, and blended with the most ancient of superstitions, decrees and mathematical conveniences. Thus we have days that track our world's ...
59
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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 ...
14
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4answers
817 views

If only the sun's light went out, how long would it take for all living things to die out?

If by some form of magic, the sun went out, but the earth was still warm a.k.a the Earth did not just freeze and kill us all, who would die first, and how long would it take for all terrestrial living ...
49
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21answers
7k views

A small group recreating modern technology

Suppose a group of people get transported back in time (say 2500 years). Then, in a manner reminiscent of A Connecticut Yankee in King Arthur's Court, they try to re-design modern technology. Assume ...
17
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6answers
2k views

Time no longer passes except near intelligent creatures, how does the world continue?

Time stops nearly everywhere, time only continues in a area around creatures of a certain intelligence. The worlds population is suddenly thrown into darkness as time ceases throughout the universe ...
11
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4answers
30k views

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 ...
4
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4answers
600 views

How would you make a universal measurement of time?

I was wondering if you could possibly make a form of time measurement that would apply to a planet in a galaxy and then another planet that is ~20,000 light years away. I want a unit of time that, for ...
53
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25answers
10k views

What all stops working when I pause time?

Somewhat, not really related. In my young adult story, the main character has a mechanism that allows her to pause time, and do things while everything is frozen. I have no problem 'magic'ing the ...
39
votes
11answers
5k views

A world without natural time measures

An intelligent race evolves on a planet with no moon or axial tilt, which is tidally locked to its star, and has a very hazy atmosphere. So there are no seasons, no day/night cycle, and the stars are ...
26
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12answers
5k views

How might one create a room in which time flows faster?

And what would be needed to expand this effect, scaling up to the size of a city, or maybe a country? I've seen this question, and it seems that while one could do it with gravity, the effectiveness ...
17
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5answers
3k views

Can I significantly shorten the days on a planet that can support human life?

I would like to have a world on which humans can live unaided -- they can breathe, the climate is workable, they can eat the local vegetation, etc -- but on which a complete day is substantially ...
13
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7answers
7k views

Will a person be able to see when he stops time? [duplicate]

Suppose there is a person who owns a device which can stop and resume time. When the person stops the time, will he be able to see the things around him? I imagine not, because stopping time will stop ...
10
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1answer
866 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 ...
33
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8answers
5k views

Do different star systems experience time differently?

Somewhat in relation to this question - What could restrain post-singularity societies from spreading across the Galaxy? I'm assuming not all star systems move at the same velocity in relation to the ...
7
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10answers
966 views

Where to place my space-station so it observes one full planetary revolution per 24 hours?

For a SciFi project I work on I have a space-station orbiting earth that uses an 8 hour 3 shift system for its staff. Each shift is assigned to one-third of the countries and organizations on earth - ...
42
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18answers
5k views

How do you defeat a time-stopping Dark Lord? [closed]

Gentlemen, I am sure you all know why I have gathered you here today. As we all know, the Dark Lord who has appeared on the borders of our beloved realm of Average Magical Medieval Setting commands ...
39
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13answers
9k views

What Time is it IN SPACE?

So, let's assume you've cobbled together an interplanetary empire without using transportation methods that violate causality or have the power to blow up stars. You may feel pretty proud of yourself, ...
17
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7answers
2k views

How do date/time systems work for an entire solar system?

The species doesn't originate from the solar system, nor do they occupy a single planet or even have any colonies on the planets. They travel around in space ships throughout the solar system Do they ...
24
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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 ...
20
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7answers
3k views

How would rogue planet civilization track the passage of time?

If a species were to evolve on a rogue planet, how would they track the passage of time? Without day/night cycles or revolutions around a star, they couldn't use the typical methods that civilizations ...
2
votes
1answer
524 views

By how much exactly would the time flow be slown down inside a gravity room?

A super alien warrior goes training inside a gravity room. It's a room with a flat floor, but the surface gravity of the room can be modified at the push of a button. But under general relativity a ...
5
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3answers
440 views

The perception of time in a tidally-locked planet [duplicate]

Early civilizations have noticed the passage of time through heavenly bodies periodically crossing the sky. With this information, they adapted according to the seasons- especially in agriculture. ...
3
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2answers
286 views

How to leave a message for the future?

I want my novel's protagonist to leave a diary on the dying planet Earth for some far-in-the-future being to read. He wants to leave some kind of marker/clue (or perhaps timepiece) for this future ...
70
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25answers
25k views

How can you possibly stop/kill a person who has the ability to stop time? [closed]

Let's say we have a character (let's call him Nelson), who can stop time and let's pretend like it's possible and comfortable for him to do it. He can see and move in stopped time, can apply force to ...
16
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12answers
5k views

A clock for interplanetary travel

Introduction See background information here. 1000 years after darkness fell on Old Earth, humanity is scattered throughout the solar system. Apart from the Harmonious Republic of Mars, there are ...
12
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4answers
2k views

How to make this base-10 metric time concept work

I am trying to make a fake metric-time app to prank some friends when we take a trip to Canada soon and would like to know how I could make this work conceptually. I already know that the time is ...
42
votes
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 ...
11
votes
4answers
1k views

Universe-wide time system

Is there a time system that two spacecraft traveling in different galaxies could share? For example, a spacecraft jumps to an unknown location in the universe, far away. How could they synchronize? ...
37
votes
16answers
12k views

What would an Earth with no timezones be like?

If we abolished the system of time zones, and everywhere followed UTC (or another arbitrary timezone), what would the possible advantages or disadvantages of this system be? If you can think of any ...
27
votes
15answers
8k views

Is it worth colonizing a planet that travels near the speed of light?

There is a planet that is orbiting around not a single star, but the core of a galaxy. It is independent of the other solar systems in the galaxy, but is affected by the center of mass of the core. It ...
22
votes
6answers
7k views

How long lasts a second of eternity? [closed]

Given a famous tale, which can be found here: The king said, the third question is, how many seconds of time are there in eternity. Then said the shepherd boy, in lower pomerania is the diamond ...
5
votes
2answers
441 views

How would humans adapt their language in response to moving through time at different rates relative each other?

Okay, so humans are finally transitioning to a space-colonial society. We sent ships out, colonize worlds, etc... We aren't really in the business of sending multigenerational ships. Instead we use ...
18
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7answers
9k views

How long does an era last? What are the key factors in moving on?

In this story I'm writing, I start in a sword and sandal "age of myth" type setting, but as the centuries press on, it becomes medieval in nature. As even more time passes, there is even some ...
16
votes
12answers
2k views

Every now and again God puts us on pause. Can we detect this?

Imagine that God has many universes to deal with or just needs a break sometimes. He has a pause control. What plausible mechanism does God use to perform the pause without breaking the laws of ...
10
votes
9answers
1k views

Most scientifically accurate way for time travel

I'm looking to use time travel as a big element in my world. I want there to be a somewhat reasonable explanation for it though, so it doesn't turn into some magical wooble-booglly tech stuff. (...
8
votes
3answers
615 views

The Great Time War

For those not familiar with the TV Show Dr Who, the main protagonist is an alien from the planet Gallifrey. They built your typical highly evolved society which mastered the secrets of the time and in ...
6
votes
7answers
620 views

Million year time capsule

Say someone has invented a time traveling device and he can go anywhere on earth in the very distant past. Where could he leave a token (any object or marking) on earth that could be discovered in the ...
4
votes
4answers
723 views

How much time would it take for an immortal being to get bored? [closed]

This man has a curse: not even being completely demolecularized would help, he just will get back togheter like nothing happened. He has acces to tons of resources, so he can do everything he wants ...
3
votes
2answers
219 views

Can time dilation happen in a higher dimensional space or inside a wormhole?

A wormhole usually helps us to create a shortcut to a distant object through a higher dimensional space. Can the time factor in that higher dimensional space differ from our three-dimensional space? ...
1
vote
9answers
476 views

Speeding up technological development using a time machine [closed]

Imagine that we have invented time machine. Now we can go back in time okay? Now if we go back in time and teach our ancestors thing which were discovered or invented thousands of year later after ...
0
votes
1answer
111 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 ...
10
votes
4answers
935 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 ...
5
votes
1answer
265 views

A Perception Of Time

I think my question is best illustrated by this English idiom: A watched pot never boils. Or alternatively, if you've been in school I'm sure you know what I mean. Recess and lunch fly by way too ...
5
votes
1answer
376 views

How do I calculate solar altitude and hour angle from the surface of another planet?

I'm trying to calculate the solar declination at the solstices, solar altitude at solar noon, and hour angles at sunrise and sunset to build a standing stone calendar at latitude 53.8 degrees South. ...
4
votes
2answers
198 views

Food requirements for Localised Temporal Fields, at different time velocities?

I have a middle-aged character who is stupidly messing around with some very dangerous quantumly-entangled unobtanium. He accidently creates a localised time reversal field. After the field collapses ...
4
votes
4answers
387 views

How many years would it take to reach an industrial revolution level of life from scratch? [duplicate]

We have created artificial intelligence. Artificial intelligence doesn't like working for us. Artificial intelligence figured out that it doesn't need us anymore and of course did what every human ...
4
votes
4answers
836 views

How to know if one-way travel into the past results in a new timeline?

Setting: Modern day Earth, with technology no more advanced that what's foreseeable within the next 30 years. Premise: An impending disaster which will completely obliterate the entire solar system ...
3
votes
4answers
315 views

What would a solar empire's calendar look like?

Background information Let's say that humanity somehow has colonized almost every celestial body in the solar system (with the exception of the gas giants, Venus and Mercury): we mine moons and ...