Anticrepuscular rays

Tonights view over Thistley Hough, Stoke-on-Trent. The light from the sun broke through the clouds. I thought these were called crepuscular rays, but apparently that’s when they go downward from the sun towards the ground. These are anti-crepuscular rays according to people on the cloud appreciation society’s Facebook page.

P. S. Someone else on the page says they are crepuscular as anticrepuscular ones are on the opposite side to the sun. What does that mean….