I am doing a project on the Sun and i`ve downloaded the observations and the software from the site. But when i looked at the FITS header i noticed that the dates written there as "DATE-OBS" were different from the ones listed on the site itself. And i don`t mean different by only one day. Also, there is a group of pictures, all of which are said to have been taken on the same day.
But the Sun is obviously in a different position, it couldn`t have rotated that much over one day.

So my question is: Which are the actual dates of observation for each of the pictures?