“As to why we don’t make a bracha…my theory is that to make a bracha, there needs to be a חפצא, a tangible, physically reactive phenomenon. The eclipse is merely an alignment; nothing is משתנה in the moon or sun.“
Avira,
Ever heard of ברכת החמה? It’s done when the sun is at the exact same spot as ששת ימי בראשית