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Questions tagged [time-keeping]

For questions about systems used to distribute time into certain periods adapted to the purposes of common life, as hours, days, weeks, months, years, etc.

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5answers
648 views

A Roman-technology clock run by slaves - how to make it accurate

In a land similar to the Roman Empire, slaves are used to drive machinery. Mostly this is a matter of getting them to pull carts or wind handles. The Emperor wants a clock that is accurate to the ...
34
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11answers
5k views

What's an astronomical event which happened about 10,000 years ago, which humans could have noticed?

Bob is older than he looks. Specifically, even though Bob looks like he's in his twenties or thirties (it's hard to tell), he was actually born in Europe about ten thousand years ago, long before the ...
13
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5answers
1k views

What would the current period of history be called in the future? [closed]

In my SciFi book, 400 years from now, humanity has expanded throughout the solar system and managed to survive the death Earth. In their history, Earth fell during the third world war in 2093 CE and ...
9
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9answers
2k views

Explanations for a Uniform calendar in most of the world

I have a very fragmented world, composed of different kingdoms/nations most of which have no connections with the others. How can I explain the adoption of the same calendar (or metric system for that ...
0
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4answers
135 views

What would our calendars be like with no astronomical cycles? [duplicate]

What would calendars and our concept of time be like if there were no astronomical cues? If we lived in perpetual daylight and perpetual summer. The Sun, Moon, and stars are all fixed in the sky. ...
6
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2answers
104 views

How to distinguish the different phases of the day when the sun rises and sets multiple times?

Obviously there would be a lot of small (not to mention a couple large) changes humans would need to get used to on a planet that rotates much faster than Earth. The biggest one I’m concerned about ...
5
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3answers
175 views

How far can civilization go without inventing the calendar?

While only counting seasons and years, but not weeks or months, how far can human civilization progress? Can they reach the middle ages? Or is the invention of the calendar such a cornerstone of ...
9
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5answers
296 views

How would dwarves tell time (calendar)

Information I am developing the culture of the dwarves in my fantasy world, and I am interested in a calendar system for my dwarves. Yes, I am aware of the question How would my dwarves tell time ...
0
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3answers
100 views

Time-keeping system throughout a galaxy? [duplicate]

In my world, humanity has expanded to conquer most of the galaxy. One governing body dominates the galaxy, and faster-than-light travel is commonplace. The issue is, how can time be kept in such a ...
1
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3answers
157 views

How to measure time outside of Earth? [duplicate]

In pop culture, whenever an alien species or someone outside of Earth talks about time, they always refer to time using the words "year(s)", "month(s)", "hour(s)", and "minute(s)" etc which are ...
-2
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1answer
135 views

How does one calculate the length of a planet's solar year?

I have a planet with a specified sidereal day and sidereal year, and a solar day. But how can I determine the length of its solar year from this? Sidereal day: 1d 1h 52m 11s Solar day: 1d 1h 54m 36....
2
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2answers
124 views

How would someone keep time on Mars?

I understand that a Sol is a Martian day, a little longer than a day on Earth (... 30 minutes I think?) and there are 24 months using the Darian calendar. So if people lived on Mars, what is a casual ...
12
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1answer
610 views

How to calculate hour angle of a moon?

I am trying to construct a standing stone calendar for my world Jasmi, located at latitude 53.8 degrees South. To do this, I need the hour angle of moonrise and moonset for my world. The problem is ...
4
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4answers
485 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 ...
5
votes
1answer
265 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
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2answers
319 views

How would a Lunar Calendar be set up with 2 moons?

So I have a super-Earth that has 2 moons. Moon 1 is a bit smaller than our moon, and has an orbital period of 19.25 earth days. Moon 2 is larger than our moon and has an orbital period of 147.15 days. ...
8
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2answers
287 views

Galactic Calendar System

In a galactic civilization with multiple races, what would be an ideal calendar system that everyone could use? FTL travel is possible (please no answers involving the implications of FTL, for the ...
8
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1answer
600 views

Year marking astronomical event with extreme perihelion precession

For us earthlings, the concept of "year" came from the observation that the Sun reaches a minimum and a maximum span in the rise-set path in the sky. On a planet experiencing extreme perihelion ...
23
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5answers
4k views

What do Martians use for months and weeks?

Assume Mars has developed an indigenous civilization of its own, perhaps as seen in Edgar Rice Burroughs' A Princess of Mars. Much like Earth, Mars' years and days would be significant for any ...
17
votes
4answers
885 views

Stealing day(s) from my post-apoc bunker society

In a post-apoc world there are societies of people that live their entire lives in huge underground bunkers. They live there, as did their parents, as did their parents, and so forth. Their only ...
2
votes
9answers
334 views

Binary star system, What time is it?

You are native to a planet that falls between two suns, thus ensuring eternal sunshine. How would we be able to tell the time? Do you formulate some kind of system based on which sun is in the sky at ...
16
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15answers
5k views

How to tell someone they have travelled in time, by gesturing?

Two strangers, Alice and Daisuke, are from two different cultures and speak different languages. Oh, and they are from two different times! Alice, was unwillingly, unknowingly and unexpectedly ...
5
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3answers
322 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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1answer
215 views

The 372-Day Calendar

There seems to be a connection between orbital revolution (one year) and distance from the star the body orbits. For example, Earth orbits the sun at a distance of 93 million miles and completes one ...
1
vote
0answers
84 views

What kind of cultures would develop on a moon of a gas giant? [closed]

Picture yourself a gas giant which has a system of many moons. on the probably closest moon, which has an atmosphere close to earth's, its orbital period is close to earth's rotation period (Mimas of ...
12
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5answers
764 views

Acceptable time count

Supposedly we human are able to terraformed Mars decades from now, then in few hundred years able to enhance our genes to be more adaptable to live on harsh conditions, creating space colonies and ...
0
votes
7answers
460 views

Can a planet have half the orbit and rotation times of Earth? [closed]

Ok, my head hurts after thinking about this and writing this question at least six times. Finally I have something that might pose as a question. Can a planet have a 6 Earth-month rotation around its ...
7
votes
3answers
295 views

Restoring the current date based on ~100yr old sources

Imagine that humanity find out that their current date allegedly representing years A.D. is several years off. The only unquestionable timestamped data on the physical state of the Universe (...
10
votes
5answers
495 views

What calendar or time cycle would an underground civilization use? [duplicate]

The majority of the calendars on earth have used either lunar or solar cycles to keep track of time, ie days, months, years. What would a civilization cut off from the sun or moon use to keep track ...
15
votes
3answers
2k views

Gregorian Calendar and dates before its implementation - how to correctly place an event before 1582? [closed]

For dialogues occurring in the story the characters would use their respective culture/civilization calendar, but for the one writing the story a way to use a familiar calendar to place an event is ...
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votes
3answers
206 views

Is time management obsolete? [closed]

Just to introduce myself, I'm a software developer. I've been working in agile environment for past few years, which made me notice some changes in the way people around me handle their daily tasks. ...
1
vote
2answers
232 views

would people be happier if we got rid of Thursday and had 6 day weeks? [closed]

We would keep our calendar the same for dates/months/etc, but we would rotate the days faster. It seems like a win - more weekends, shorter working weeks, easier to divide shift work etc for the ...
5
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4answers
608 views

Can a species without uniform brain function time survive?

The magical species Zartika living on planet NB-8723D has organisms whose brains function at different speeds. All have almost the same physical body, but there lies some difference in their brains. ...
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 ...
39
votes
12answers
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 ...
2
votes
2answers
175 views

Apocalypse shelter with date jumping around [closed]

In a science fiction setting, what can explain an electronic calendar's date jumping around, backwards or forwards for days at a time, starting from a whole number like 01/01/2000, and bad things ...
4
votes
4answers
243 views

Accuracy of timekeeping based on the age of Earth

In many countries, we number the years based off of proximity to an event in the Christian religion - we are over 2016 years past that date. However, in this scenario, religion has become less ...
0
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1answer
131 views

Multiple moons orbiting a gas giant: How would I calculate how long it appears for a closer moon to orbit the planet from a further-out moon?

I have a habitable moon orbiting a gas giant, and there is another moon orbiting the planet on a closer orbit. The cultures on the near-side of the further, habitable moon use the transit of the ...
42
votes
19answers
9k views

Standardisation of Time in a FTL Universe

Here on Earth, time standardisation was enabled by the invention of accurate time pieces which allowed us to create a global constant (GMT/Zulu time) and regional offsets. If we travel outside our ...
4
votes
1answer
358 views

Timekeeping Systems on a Habitable Moon

Ok, this is take two. Hopefully this is specific enough. I have a link to the original question here. And for those of you eager to see my sources for this, I'll link two videos here from the ...
7
votes
1answer
223 views

What are some possible ways a civilization's time-keeping would be different if originating on the moon of a gas giant? [closed]

(For the record, this is my first question here. Please be gentle, I dunno how this works yet.) So I understand how gas giants and their many, many moons operate, and I can make educated guesses ...
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votes
2answers
217 views

How survivors should measure time on tidal locked planet?

Setting: Earth-like planet orbitting red dwarf. Survivors from the Earth. (Only one planet, not post-planet civilization like in question: How Would a Post-Planetary Civilization Measure Time? ) ...
3
votes
1answer
95 views

Would people living on different ringworlds around the same star measure time differently?

Okay so I have a sci-fi world masquerading as a fantasy world where numerous different genetically-engineered humanoids live on nine different ringworlds orbiting an artificial Earth-mass black hole (...
6
votes
6answers
818 views

How would my dwarves tell time underground?

How could they keep track of the "Surface World Time?" Parameters: Very little contact with the surface world Phobia of "just go and check" It is needed to know when traders will descend They don't ...
7
votes
5answers
178 views

Different ways geographically distant cultures might measure time?

Okay so in my world, I have two pre-industrial societies that live thousands of miles apart from each other on their ringworld. One lives in a desert climate similar to India or the Middle East while ...
3
votes
4answers
288 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 ...
22
votes
9answers
2k views

If clock and calendar was reinvented with today's knowledge, what could they look like?

Our notion of recording and communicating time and date is based on very old concepts, many of them being built upon flawed assumptions (that the Sun should be at exact south at noon, that a year ...
6
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2answers
360 views

My BIG World Needs More Suns

Summary version: So we're talking people living on top of 30 miles of topsoil, fake dino fossils and water on the outer surface on a hollow (but sturdy) unobtanium sphere with a radius about 1 AU. ...
4
votes
3answers
186 views

Measure time with longer days?

I'm making a planet where a day last 28 Earth days and I'm trying to figure out what could be the units of measure of time. The planet has these features: A day last 28 Earth days. There is no moon. ...
2
votes
4answers
650 views

Should the Spring Equinox be New Year's Day? [closed]

Time and time again, the history of the calendar is so complicated because of how arbitrary the system is. Before Julius Caesar, a whole year in the Roman calendar is ten months. The Chinese ...