<p>I think you are looking for the constructed language called <a href="https://mw.lojban.org/papri/The_Complete_Lojban_Language" rel="nofollow noreferrer">Lojban</a></p>
<p>According to an earlier reference to its <a href="http://lojban.org/publications/reference_grammar/chapter10.html" rel="nofollow noreferrer">grammar</a>,</p>
<blockquote>
<p>Technical note for readers conversant with relativity theory: The Lojban time tenses reflect time as seen by the speaker, who is assumed to be a ``point-like observer'' in the relativistic sense: they do not say anything about physical relationships of relativistic interval, still less about implicit causality. The nature of tense is not only subjective but also observer-based.</p>
</blockquote>
<p>Here is a specific reference to its use of a &quot;<a href="https://mw.lojban.org/papri/Relativistic_tense_in_Lojban" rel="nofollow noreferrer">relativistic tense</a>&quot;</p>
<blockquote>
<p>There's been a proposal to have words expressing relativistic tenses that are different &gt; from usual past, current and future used in most historical natural languages.</p>
<p>How this 4th tense would work? Consider we are 3 light years away from a star that explodes. And in 3 years we see the explosion. So what? How do we use this 4th tense?</p>
<p>It would be a tag with a modifier ue'ei.</p>
<p>ue'ei = [MOhI] 4th relativistic tense modifier</p>
</blockquote>
<p>There's also an interesting set of charts describing in detail the use of <a href="https://mw.lojban.org/papri/Relativity_theory_in_Lojban" rel="nofollow noreferrer">relativity theory in Lojban</a> on the current lojban language site.
<a href="https://i.sstatic.net/KTQ7k.png" rel="nofollow noreferrer"><img src="https://i.sstatic.net/KTQ7k.png" alt="Lojban Relativistic tense chart" /></a></p>
<p>Lastly, in the <a href="http://lojban.github.io/cll/10/1/" rel="nofollow noreferrer">Lojban Reference Grammar site</a>, there is this little intriguing tidbit on Lojban tense usage.</p>
<blockquote>
<p>In Lojban, the concept of tense extends to every selbri, not merely the verb-like ones. In addition, tense structures provide information about location in space as well as in time. All tense information is optional in Lojban</p>
</blockquote>

CC BY-SA 4.0
2023-07-19T15:54:00.390Z
Baseline CLL-style Lojban has the standard three tenses. There is an experimental word [{xa'ei}](https://vlasisku.lojban.org/xa'ei) which implements a objective fourth tense, and a companion {xa'e} for subjective fourth tense. There is no consensus; see [this infamous discussion](https://www.lojban.org/files/papers/4thtense) for context.

I'm not downvoting; instead, please edit the question to reflect modern Lojban sensibilities.
Corbin
CC BY-SA 4.0
2019-03-05T23:30:45.263Z
2019-03-06T15:44:53.930Z
2020-06-18T08:37:27.510Z
Karlomanio
<p>For readers who aren't familiar with the Theory of Relativity, here is a sketch of how the Special Theory of Relativity structures space and time:</p>

<ul>
<li>There is a point "here and now" where the observer is located</li>
<li>There is an "absolute past" meaning the region of space and time wherefrom light signals can reach the point "here and now". This region is also termed <em>backward light-cone</em></li>
<li>There is an "absolute future" meaning the region of space and time whereto the observer can send light signals. This region is also called <em>foreward light-cone</em></li>
<li>There is a "disconnected" region that can neither be reached by light signals nor send light signals to the observer.</li>
</ul>

<p>While present, past, and future are commonly found in natlangs and conlangs of all flavours, the disconnected region is a new feature brought in by the Special Theory of Relativity. Are there conlangs with a tempus system including such a region?</p>

<p>EDIT: In real life, the disconnected region is not determined by the speed of light but by the availability of direct communication channels. Thus a sentence like <em>My husband is in his working office now</em> is about the disconnected region (assume no smart phone stalking to verify the sentence).</p>

CC BY-SA 4.0
2018-11-13T11:08:01.087Z
Hmm, could irrealis modality sort of fit the disconnected region?
curiousdannii
CC BY-SA 4.0
2018-11-13T12:40:47.233Z
I don't think so, you can talk in the irrealis about the present, the reachable future or the reachable past. On the other hand, you can talk about things assumed to real (just not observable, so no evidence is available) happening in the disconnected region.
Sir Cornflakes
CC BY-SA 4.0
2018-11-13T12:45:28.533Z
Right, it's not strictly correct, but it's a possible parallel using naturally occurring semantic features.
curiousdannii
CC BY-SA 4.0
2018-11-16T09:53:59.673Z
Can you maybe give an example of a sentence that could potentially use some sort of disconnected tense? I'm having a hard time visualizing what using such a tense would actually be talking about.
Sparksbet
CC BY-SA 4.0
2018-11-16T10:13:34.967Z
@Sparksbet: OK, done that.
Sir Cornflakes
CC BY-SA 4.0
2018-11-16T18:35:48.233Z
But if it is actually about available direct communication channels, why would you need inspiration from SRT? Related thought: I think the most important part of a relativistic tense system would be time necessarily being relative to an observer.
Cecilia
CC BY-SA 4.0
2018-11-16T18:38:13.980Z
@Richard Having a full fledged relativistic time system in a spaceship based conlang would be gorgeous. Has someone constructed such a language?
Sir Cornflakes
CC BY-SA 4.0
2018-11-16T19:07:17.163Z
@jknappen I thought Klingon, but it has a really conservative time system. Ithkuil only has a stem for time "relative to some other temporal frame". Tsrul ( http://conlang.wikia.com/wiki/Tsrul ) has a temporal case, which could maybe be used to indicate effects of STR. A language really like what you describe seems not to have been constructed yet.
Cecilia
<list-of-languages><inspiration><unnatural-features><tense-aspect-mood>
Are there constructed languages with a tense system inspired by Theory of Relativity?
# Are there constructed languages with a tense system inspired by Theory of Relativity?

(Asked by: username_0 on 2018-11-13)

For readers who aren't familiar with the Theory of Relativity, here is a sketch of how the Special Theory of Relativity structures space and time:

* There is a point "here and now" where the observer is located
* There is an "absolute past" meaning the region of space and time wherefrom light signals can reach the point "here and now". This region is also termed *backward light-cone*
* There is an "absolute future" meaning the region of space and time whereto the observer can send light signals. This region is also called *foreward light-cone*
* There is a "disconnected" region that can neither be reached by light signals nor send light signals to the observer.

While present, past, and future are commonly found in natlangs and conlangs of all flavours, the disconnected region is a new feature brought in by the Special Theory of Relativity. Are there conlangs with a tempus system including such a region?

EDIT: In real life, the disconnected region is not determined by the speed of light but by the availability of direct communication channels. Thus a sentence like *My husband is in his working office now* is about the disconnected region (assume no smart phone stalking to verify the sentence).

**Tags:** list-of-languages, inspiration, unnatural-features, tense-aspect-mood
> **Comments:**
> **username_1**: Hmm, could irrealis modality sort of fit the disconnected region?  
> **username_0**: I don't think so, you can talk in the irrealis about the present, the reachable future or the reachable past. On the other hand, you can talk about things assumed to real (just not observable, so no evidence is available) happening in the disconnected region.  
> **username_1**: Right, it's not strictly correct, but it's a possible parallel using naturally occurring semantic features.  
> **username_2**: Can you maybe give an example of a sentence that could potentially use some sort of disconnected tense? I'm having a hard time visualizing what using such a tense would actually be talking about.  
> **username_0**: @Sparksbet: OK, done that.  
> **username_3**: But if it is actually about available direct communication channels, why would you need inspiration from SRT? Related thought: I think the most important part of a relativistic tense system would be time necessarily being relative to an observer.  
> **username_0**: @Richard Having a full fledged relativistic time system in a spaceship based conlang would be gorgeous. Has someone constructed such a language?  
> **username_3**: @jknappen I thought Klingon, but it has a really conservative time system. Ithkuil only has a stem for time "relative to some other temporal frame". Tsrul ( http://conlang.wikia.com/wiki/Tsrul ) has a temporal case, which could maybe be used to indicate effects of STR. A language really like what you describe seems not to have been constructed yet.  

---

## 1 answers

### Answer by username_4 on 2019-03-05. Score: 3 | Accepted answer

I think you are looking for the constructed language called [Lojban](https://mw.lojban.org/papri/The_Complete_Lojban_Language)

According to an earlier reference to its [grammar](http://lojban.org/publications/reference_grammar/chapter10.html),

> Technical note for readers conversant with relativity theory: The Lojban time tenses reflect time as seen by the speaker, who is assumed to be a ``point-like observer'' in the relativistic sense: they do not say anything about physical relationships of relativistic interval, still less about implicit causality. The nature of tense is not only subjective but also observer-based.

Here is a specific reference to its use of a "[relativistic tense](https://mw.lojban.org/papri/Relativistic_tense_in_Lojban)"

> There's been a proposal to have words expressing relativistic tenses that are different > from usual past, current and future used in most historical natural languages.
>
> How this 4th tense would work? Consider we are 3 light years away from a star that explodes. And in 3 years we see the explosion. So what? How do we use this 4th tense?
>
> It would be a tag with a modifier ue'ei.
>
> ue'ei = [MOhI] 4th relativistic tense modifier

There's also an interesting set of charts describing in detail the use of [relativity theory in Lojban](https://mw.lojban.org/papri/Relativity_theory_in_Lojban) on the current lojban language site.
[![Lojban Relativistic tense chart](https://i.sstatic.net/KTQ7k.png)](https://i.sstatic.net/KTQ7k.png)

Lastly, in the [Lojban Reference Grammar site](http://lojban.github.io/cll/10/1/), there is this little intriguing tidbit on Lojban tense usage.

> In Lojban, the concept of tense extends to every selbri, not merely the verb-like ones. In addition, tense structures provide information about location in space as well as in time. All tense information is optional in Lojban

> **Comments:**
> **username_5**: Baseline CLL-style Lojban has the standard three tenses. There is an experimental word [{xa'ei}](https://vlasisku.lojban.org/xa'ei) which implements a objective fourth tense, and a companion {xa'e} for subjective fourth tense. There is no consensus; see [this infamous discussion](https://www.lojban.org/files/papers/4thtense) for context.  I'm not downvoting; instead, please edit the question to reflect modern Lojban sensibilities.  

---

