Uniformly accelerating charge and radiation

[Selfluminous]

Last night when i was bored, i googled some stuffs about radiation of accelerating charge and saw this http://www.mathpages.com/home/kmath528/kmath528.htm

I don't understand the beginning of the article, what does the author mean by "stationary and accelerating" ? or "stationary" ?

 

[granpa]

http://www.pbs.org/wgbh/nova/einstein/relativity/