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synchronization between altitudes on earth vs Einstein desynchronization
<!-- NOTE [[Time dilation]] redirects to this section, so the section name should not be changed without amending that redirect. -->
<!-- NOTE [[Time dilation]] redirects to this section, so the section name should not be changed without amending that redirect. -->
[[Image:Light cone.png|right|thumb|Light-cone diagram]]
[[Image:Light cone.png|right|thumb|Light-cone diagram]]
Gravitational time dilation (explaining the desynchronization of clocks) between altitudes is incompatible with a correct physical description of a rising sun on earth (each time synchronized between altitudes) or the fact that two eclipses are separated by a same interval of time at all altitudes.
One important consequence of relativity is that an observer in one reference frame will not in general observe a clock in another frame to be "ticking" at the same rate as one in the observer's own frame.
One important consequence of relativity is that an observer in one reference frame will not in general observe a clock in another frame to be "ticking" at the same rate as one in the observer's own frame.