Thanks Carole for the infos, I did this gradient for the first time creating Day 1 on sunday. I tried the way you described it, but apparently no way to retrieve the infos about it.
I tried now something else to get the gradient and use it again. I opened the file Day 1, clicked on the pick tool, then on the background layer with the gradient, made control + c, opened a new empty file, control + v and saved it as new pspimage. Now I will try to save it as a preset ….
I take the time every day to look at nature and around me, that is why I called the magazine “daily discoveries” :-)!