[tz] Shortz circuit? (Spoiler)

[random832 at fastmail.us]

On Fri, Sep 6, 2013, at 16:48, Arthur David Olson wrote:
> (Spoiler ahead.)
> 
> (Yes, really.)
> 
> Today's "New York Times" crossword gives "Prime meridian std." as the
> clue
> for the
> three-letter entry at 44 down; the solution, according to...
>     http://www.xwordinfo.com/Crossword?date=9/6/2013
> ...is "GST."
> 
> Rather than GMT or BST.
> 
>     @dashdashado

Wikipedia says:
"Greenwich Sidereal Time, a variant of Greenwich Mean Time used in
astronomy"

A couple of the past entries do mention astronomy:
http://www.xwordinfo.com/Finder?word=GST