Starship Asterisk*

I follow the APOD RSS feed (http://apod.nasa.gov/apod.rss) and in normal use every day i see the new APOD, but i also see yesterday's APOD appear in the feed again. I've worked out that this is because when the new APOD is posted it's URL is given as "http://antwrp.gsfc.nasa.gov/apod/astropix.h...