If you are a scientific sort of person, you could calculate that, at a 44° angle from the sun the light refraction will create a rainbow on rain or water spray. I mostly just wander around and take pictures. I’m thinking that this might be Johnson’s Canyon in Banff National Park, but I could be wrong. Shooting film there is now EXIF or GPS information that is embedded, until you digitize the file.
Nikon FM, Tamron 70-210mm, Kodachrome 64
In the best light…