# Default center of rotation

**URL:** <https://discourse.slicer.org/t/default-center-of-rotation/14584>\
**Category:** Support\
**Tags:** transforms\
**Created:** [November 13, 2020, 9:04am UTC](https://discourse.slicer.org/t/default-center-of-rotation/14584 "2020-11-13T09:04:33Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![janneke\_slicer](https://avatars.discourse-cdn.com/v4/letter/j/ebca7d/32.png) [@janneke\_slicer](https://discourse.slicer.org/u/janneke_slicer)\
**Post date:** [November 13, 2020, 9:04am UTC](https://discourse.slicer.org/t/default-center-of-rotation/14584/1 "2020-11-13T09:04:33Z")

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Hello,

I am rotating an image in the Transforms module. I am wondering what the default center of rotation point is, and if I can extract that point in world coordinates? Or is this simply the image origin?

Thank you.

Janneke

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**Author:** ![Fernando](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/fernando/32/5640_2.png) [@Fernando](https://discourse.slicer.org/u/Fernando)\
**Post date:** [November 13, 2020, 12:47pm UTC](https://discourse.slicer.org/t/default-center-of-rotation/14584/2 "2020-11-13T12:47:35Z")

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Hi, Janneke. The default center of rotation is the origin of the physical coordinates, where (R, A, S) = (0, 0, 0) mm. This is typically not the voxel with index (0, 0, 0) of the image, which is where the image origin is.

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**Author:** ![janneke\_slicer](https://avatars.discourse-cdn.com/v4/letter/j/ebca7d/32.png) [@janneke\_slicer](https://discourse.slicer.org/u/janneke_slicer)\
**Post date:** [November 13, 2020, 1:46pm UTC](https://discourse.slicer.org/t/default-center-of-rotation/14584/3 "2020-11-13T13:46:38Z")

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Hi Fernando,

Thank you for your quick response.  
That makes sense and solves my problems, thank you.

Janneke