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written by Michael Fowler and Jacquie Hui Wan Ching
This simple animation illustrates the principle of time dilation as predicted by special relativity. The simulation consists of two light clocks, one at rest and the other moving at a fraction of the speed of light. The user can change the speed of the moving clock.

Please note that this resource requires Flash.
Subjects Levels Resource Types
Classical Mechanics
- Relative Motion
= Moving Reference Frames
General Physics
- Measurement/Units
- Reference Frames
- Special Relativity
= Simultaneity
= Time Dilation
- Lower Undergraduate
- High School
- Upper Undergraduate
- Instructional Material
= Curriculum support
= Interactive Simulation
- Audio/Visual
= Movie/Animation
Intended Users Formats Ratings
- Educators
- Learners
- application/flash
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Access Rights:
Free access
© 2003 Michael Fowler
Simultaneity , Special Relativity, Speed of Light, Time Dilation, frames of reference, reference frames
Record Cloner:
Metadata instance created July 25, 2007 by Enrique Suarez
Record Updated:
June 26, 2012 by Caroline Hall
Last Update
when Cataloged:
July 24, 2007
Other Collections:

ComPADRE is beta testing Citation Styles!

Record Link
AIP Format
M. Fowler and J. Hui Wan Ching, (2003), WWW Document, (
M. Fowler and J. Hui Wan Ching, Light Clock (2003), <>.
APA Format
Fowler, M., & Hui Wan Ching, J. (2007, July 24). Light Clock. Retrieved July 19, 2024, from
Chicago Format
Fowler, Michael, and Jacquie Hui Wan Ching. Light Clock. July 24, 2007. (accessed 19 July 2024).
MLA Format
Fowler, Michael, and Jacquie Hui Wan Ching. Light Clock. 2003. 24 July 2007. 19 July 2024 <>.
BibTeX Export Format
@misc{ Author = "Michael Fowler and Jacquie Hui Wan Ching", Title = {Light Clock}, Volume = {2024}, Number = {19 July 2024}, Month = {July 24, 2007}, Year = {2003} }
Refer Export Format

%A Michael Fowler %A Jacquie Hui Wan Ching %T Light Clock %D July 24, 2007 %U %O application/flash

EndNote Export Format

%0 Electronic Source %A Fowler, Michael %A Hui Wan Ching, Jacquie %D July 24, 2007 %T Light Clock %V 2024 %N 19 July 2024 %8 July 24, 2007 %9 application/flash %U

Disclaimer: ComPADRE offers citation styles as a guide only. We cannot offer interpretations about citations as this is an automated procedure. Please refer to the style manuals in the Citation Source Information area for clarifications.

Citation Source Information

The AIP Style presented is based on information from the AIP Style Manual.

The APA Style presented is based on information from APA Electronic References.

The Chicago Style presented is based on information from Examples of Chicago-Style Documentation.

The MLA Style presented is based on information from the MLA FAQ.

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