Clocks On a Hyperdimensional Planet

  • Thread starter Thread starter Hornbein
  • Start date Start date
  • Tags Tags
    Clocks Planet
Click For Summary

Discussion Overview

The discussion explores the concept of timekeeping on a hypothetical four-dimensional planet, focusing on the mechanics of a clock designed for such an environment. It includes theoretical considerations of spatial dimensions, rotation, and the implications for beings existing in higher dimensions.

Discussion Character

  • Exploratory
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant describes a clock for a four-dimensional planet, detailing how its hands operate based on the height of the Sun and the concept of independent rotational periods.
  • Another participant reflects on the perceived intelligence of four-dimensional beings, suggesting that their complexity might hinder simple actions.
  • A participant reiterates the idea of independent rotational periods, comparing them to Earth's rotation and questioning how a month hand would function given that months are not uniform.
  • One participant challenges the terminology used, asserting that Earth revolves around the Sun rather than rotates, and expresses uncertainty about the path a four-dimensional planet would take around a star.

Areas of Agreement / Disagreement

Participants express differing views on the nature of motion in higher dimensions, with some focusing on rotation while others emphasize revolution. There is no consensus on the mechanics of timekeeping or the implications for beings in four dimensions.

Contextual Notes

Participants mention the complexity of motion in higher dimensions and the implications for timekeeping, but do not resolve the definitions of rotation versus revolution or the specifics of how a month hand would operate.

Hornbein
Gold Member
Messages
3,801
Reaction score
3,069
On a planet with four spatial dimensions and one of time a clock would look like this.

Back Cover -  Clock Face.jpg


The hands are connected with pivots. The height of the jewel corresponds to the height of the Sun in the sky. If it is above white then it is daylight, if above black it is night. Here the sun has height 6. There is no minute hand on this clock, rather there are the blue and red hour hands. The time shown is 6p5a, with a and p corresponding to am and pm.

All this is because 4D objects can rotate on two perpendicular 2D planes. The periods of rotation are independent. This was elucidated by Clifford in about 1895. If the periods are different then the Sun can do things like dip below the horizon then rise again.

The length of the hands depends on the location of the clock on the surface of the planet. This clock is closer to the "blue" plane than it is to the "red" plane so the blue hand is longer.

https://www.researchgate.net/publication/359213812_Elsewhere_Everyday_Life_On_A_Hypergeometric_Earth.
 
  • Wow
Likes   Reactions: pinball1970
Physics news on Phys.org
It was once believed that beings from the fourth dimension would possess spectacular intelligence. The vastly greater room for neural pathways in their brains would make them as gods to us lowly humans. But in time we came to understand. Every move they make, every simple endeavor, explodes in hopeless complexity. And in time, they would find themselves without the will to even get up in the morn ... noon... early... whatever that clock says.
 
  • Like
Likes   Reactions: Lren Zvsm
Hornbein said:
All this is because 4D objects can rotate on two perpendicular 2D planes. The periods of rotation are independent. This was elucidated by Clifford in about 1895. If the periods are different then the Sun can do things like dip below the horizon then rise again.
Earth already rotates around two planes that are actually at an acute angle. The periods are independent, incommensurate and important. They are called day and year.
How does the month hand on clocks move? (Note that while hours are equal, months are not.)
 
I think the Earth around the Sun is revolve, not rotate. A 4d planet would do that too, but OP is just talking about rotating. The path the 4d planet would take around the star... I have no idea.
 

Similar threads

Replies
9
Views
4K
  • · Replies 8 ·
Replies
8
Views
2K
  • · Replies 21 ·
Replies
21
Views
5K
  • · Replies 8 ·
Replies
8
Views
3K
  • · Replies 1 ·
Replies
1
Views
3K
  • · Replies 12 ·
Replies
12
Views
3K
  • · Replies 9 ·
Replies
9
Views
4K
  • · Replies 15 ·
Replies
15
Views
6K
  • · Replies 5 ·
Replies
5
Views
2K
Replies
29
Views
9K