<p>Does the Earth rotate clockwise or anticlockwise?</p>
<p>If you are floating above the north pole of Earth you would see the Earth rotating anticlockwise(*)  if you were floating above the south pole, you would see the Earth rotating clockwise.</p>
<p><a href="https://i.sstatic.net/zLsJq.png" rel="noreferrer"><img src="https://i.sstatic.net/zLsJq.png" alt="enter image description here" /></a><br />
<sub> image from <a href="https://www.astrojem.net/rotation-of-the-earth-on-its-axis-last-approximately-24-hours/" rel="noreferrer">ASTRONOMÍA ASTRÓNOMOS UNIVERSO</a></sub></p>
<p>So the direction of rotation depends on the point of view. You're going to find that many of the truths we cling to depend greatly on our own point of view...</p>
<p>You could say &quot;I'll take the North Pole view&quot;.  Now how do we define &quot;North Pole&quot; on a pulsar (which is many many times smoother than a billiard ball).  One way to define &quot;North Pole&quot; is &quot;the pole from which a an object appears to rotate anticlockwise&quot;.  Can you see how the definition is going round in circles?</p>
<p>Or you can define &quot;North Pole&quot; in terms of magnetic field.  The North pole of the Earth has a magnetic pole (that attracts the North-seeking pole of a compass)  You can try to define the &quot;North Pole&quot; of a pulsar in terms of that which has the magnetic pole which corresponds to the that near the North pole of Earth.</p>
<p>The rotation of a pulsar is unrelated to its magnetic field. 50% of pulsars rotate clockwise about their North magnetic pole, and 50% rotate anticlockwise.  The rotational direction of a pulsar is derived from the angular momentum of the star from which it is derived.  The magnetic field is also inherited from the star. But a star can swap its magnetic field without changing its rotational direction.</p>
<p>There is no preferred direction of rotation, so a pulsar is equally likely to rotate clockwise as anticlockwise.</p>
<p>(*) and so the shadow of the gnomon of a sundial rotates clockwise, and clocks which were made by northern hemisphere horologists follow the convention. If the technological revolution had occurred in Patagonia not Europe, clocks might be very different.</p>

CC BY-SA 4.0
2022-04-25T19:50:52.623Z
Do neutron stars or Pulsars rotate around something? As our earth rotates (around the Sun) as well as Spin (around it's axis), so how do neutron Stars behave in this regard?
Autodidact
CC BY-SA 4.0
2022-04-25T20:48:59.407Z
In general, no, pulsars do not orbit other objects in the way that the Earth orbits the sun.  There are binary pulsars, and there are pulsars that are in systems with regular stars or even with black holes.
James K
CC BY-SA 4.0
2022-04-26T10:28:24.890Z
+1 for "Can you see how the definition is going round in circles?" ....
lessthanideal
CC BY-SA 4.0
2022-04-26T14:56:51.150Z
@Autodidact The terms are that our earth **revolves** around the Sun while it **rotates** around its axis and while the Sun **revolves** around the galactic center. Nearly all celestial bodies rotate to some degree or other. Neutron stars revolve around their parent galaxy's center, and if part of a binary or globular cluster or something, they may revolve around that as well.
Ross Presser
CC BY-SA 4.0
2022-04-27T10:43:00.440Z
@RossPresser would it be correct to say that all celestial bodies _except one_ rotate?  That one being the frame of reference.
Adam Barnes
CC BY-SA 4.0
2022-04-27T11:20:44.490Z
@AdamBarnes: Normally you'd want to use an inertial reference frame, not a rotating reference frame.  Things are weird (or at least more complicated) in a rotating reference frame, for example centrifugal force is a real force that you have to include in calculations to make Newton's laws of motion work.  So taking one celestial body's (or the earth's) rotation as your frame of reference would be a rather poor choice.  (Unlike the classic falling-in-an-elevator thought experiment, you *can* tell the difference between rotating or not, even with eyes closed.  Extend your arms, feel the force.)
Peter Cordes
CC BY-SA 4.0
2022-04-27T11:22:30.517Z
@PeterCordes The "extend your arms" example was viscerally efficient at making me understand, thank you.
Adam Barnes
CC BY-SA 4.0
2022-04-27T13:05:58.537Z
It's always so disappointing to lookup the word "Horologist", nothing at all to do with Freddy Krueger, etc.
RBarryYoung
CC BY-SA 4.0
2022-04-27T19:24:37.283Z
@RBarryYoung "Definition of horologist
1 : a person skilled in the practice or theory of horology"
Michael
CC BY-SA 4.0
2022-04-25T19:40:27.790Z
2022-04-25T20:48:13.413Z
2022-04-25T20:48:13.413Z
James K
<p><a href="https://imagine.gsfc.nasa.gov/science/objects/neutron_stars1.html#:%7E:text=Pulsars%20are%20rotating%20neutron%20stars,very%20powerful%20beams%20of%20light." rel="noreferrer">Pulsars</a> are rotating neutron stars observed to have pulses of radiation at very regular intervals that typically range from milliseconds to seconds. It has a very strong magnetic fields which funnel jets of particles out along the two magnetic poles.</p>
<ul>
<li>My question is how Pulsars rotate, clockwise or Anti-clockwise?</li>
</ul>

CC BY-SA 4.0
2022-04-25T18:50:03.973Z
Clockwise or anticlockwise rotation depends on (and in some cases, defines) which of the two rotational poles you're looking down at.
notovny
CC BY-SA 4.0
2022-04-26T16:05:31.740Z
Only 2D has the concept of clockwise and anticlockwise. In 3D, the rotation direction is a vector (or more accurately, a pseudovector) that can point in any direction. It gets even more interesting in 4D.
WaterMolecule
CC BY-SA 4.0
2022-04-27T16:14:10.590Z
And are pulsars the right way up, or upside-down? This is surely more important!
TonyK
CC BY-SA 4.0
2022-04-28T23:40:44.527Z
'water molecule' states that the axis of rotation 'can point in any direction'. but does it? or is there a correlation?
Colin
<star><rotation><neutron-star><pulsar><neutrons>
Rotation direction of Pulsars
Autodidact
# Rotation direction of Pulsars

(Asked by: username_0 on 2022-04-25)

[Pulsars](https://imagine.gsfc.nasa.gov/science/objects/neutron_stars1.html#:%7E:text=Pulsars%20are%20rotating%20neutron%20stars,very%20powerful%20beams%20of%20light.) are rotating neutron stars observed to have pulses of radiation at very regular intervals that typically range from milliseconds to seconds. It has a very strong magnetic fields which funnel jets of particles out along the two magnetic poles.

* My question is how Pulsars rotate, clockwise or Anti-clockwise?

**Tags:** star, rotation, neutron-star, pulsar, neutrons
> **Comments:**
> **username_1**: Clockwise or anticlockwise rotation depends on (and in some cases, defines) which of the two rotational poles you're looking down at.  
> **username_2**: Only 2D has the concept of clockwise and anticlockwise. In 3D, the rotation direction is a vector (or more accurately, a pseudovector) that can point in any direction. It gets even more interesting in 4D.  
> **username_3**: And are pulsars the right way up, or upside-down? This is surely more important!  
> **username_4**: 'water molecule' states that the axis of rotation 'can point in any direction'. but does it? or is there a correlation?  

---

## 1 answers

### Answer by username_5 on 2022-04-25. Score: 22 | Accepted answer

Does the Earth rotate clockwise or anticlockwise?

If you are floating above the north pole of Earth you would see the Earth rotating anticlockwise(\*) if you were floating above the south pole, you would see the Earth rotating clockwise.

[![enter image description here](https://i.sstatic.net/zLsJq.png)](https://i.sstatic.net/zLsJq.png)  
 image from [ASTRONOMÍA ASTRÓNOMOS UNIVERSO](https://www.astrojem.net/rotation-of-the-earth-on-its-axis-last-approximately-24-hours/)

So the direction of rotation depends on the point of view. You're going to find that many of the truths we cling to depend greatly on our own point of view...

You could say "I'll take the North Pole view". Now how do we define "North Pole" on a pulsar (which is many many times smoother than a billiard ball). One way to define "North Pole" is "the pole from which a an object appears to rotate anticlockwise". Can you see how the definition is going round in circles?

Or you can define "North Pole" in terms of magnetic field. The North pole of the Earth has a magnetic pole (that attracts the North-seeking pole of a compass) You can try to define the "North Pole" of a pulsar in terms of that which has the magnetic pole which corresponds to the that near the North pole of Earth.

The rotation of a pulsar is unrelated to its magnetic field. 50% of pulsars rotate clockwise about their North magnetic pole, and 50% rotate anticlockwise. The rotational direction of a pulsar is derived from the angular momentum of the star from which it is derived. The magnetic field is also inherited from the star. But a star can swap its magnetic field without changing its rotational direction.

There is no preferred direction of rotation, so a pulsar is equally likely to rotate clockwise as anticlockwise.

(\*) and so the shadow of the gnomon of a sundial rotates clockwise, and clocks which were made by northern hemisphere horologists follow the convention. If the technological revolution had occurred in Patagonia not Europe, clocks might be very different.

> **Comments:**
> **username_0**: Do neutron stars or Pulsars rotate around something? As our earth rotates (around the Sun) as well as Spin (around it's axis), so how do neutron Stars behave in this regard?  
> **username_5**: In general, no, pulsars do not orbit other objects in the way that the Earth orbits the sun.  There are binary pulsars, and there are pulsars that are in systems with regular stars or even with black holes.  
> **username_6**: +1 for "Can you see how the definition is going round in circles?" ....  
> **username_7**: @Autodidact The terms are that our earth **revolves** around the Sun while it **rotates** around its axis and while the Sun **revolves** around the galactic center. Nearly all celestial bodies rotate to some degree or other. Neutron stars revolve around their parent galaxy's center, and if part of a binary or globular cluster or something, they may revolve around that as well.  
> **username_8**: @RossPresser would it be correct to say that all celestial bodies _except one_ rotate?  That one being the frame of reference.  
> **username_9**: @AdamBarnes: Normally you'd want to use an inertial reference frame, not a rotating reference frame.  Things are weird (or at least more complicated) in a rotating reference frame, for example centrifugal force is a real force that you have to include in calculations to make Newton's laws of motion work.  So taking one celestial body's (or the earth's) rotation as your frame of reference would be a rather poor choice.  (Unlike the classic falling-in-an-elevator thought experiment, you *can* tell the difference between rotating or not, even with eyes closed.  Extend your arms, feel the force.)  
> **username_8**: @PeterCordes The "extend your arms" example was viscerally efficient at making me understand, thank you.  
> **username_10**: It's always so disappointing to lookup the word "Horologist", nothing at all to do with Freddy Krueger, etc.  
> **username_11**: @RBarryYoung "Definition of horologist 1 : a person skilled in the practice or theory of horology"  

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