I'm crediting Jordan Peele and the movie "Nope" for me even having an interest in this. "Nope" wasn't that good, but that's beside the point. In there one of the characters mentioned that the very first "movie" was of Black jockey on a horse.
Just on a quick search I found that on 19 June 1878, Muybridge decided to do an experiment. He rigged a race track with 12 strings and made a race-horse named Sallie Gardner gallop on the track. Sallie Gardner was a mare owned by Leland Stanford, governor of California. The galloping horse broke the strings one by one as it went through them. These 12 strings were attached with a series of 12 cameras. The associated camera took a photo as soon as the attached string would break. The result was a series of 12 photos in which 2nd and 3rd photos showed Sallie Gardner's all hooves off the ground. Once again, Muybridge was successful in answering the horse gallop question. But more importantly Muybridge was able to produce the world's first motion picture showing a galloping horse by quickly running these 12 photographs in sequence. Muybridge had actually laid the foundation of modern videography.
Just on a quick search I found that on 19 June 1878, Muybridge decided to do an experiment. He rigged a race track with 12 strings and made a race-horse named Sallie Gardner gallop on the track. Sallie Gardner was a mare owned by Leland Stanford, governor of California. The galloping horse broke the strings one by one as it went through them. These 12 strings were attached with a series of 12 cameras. The associated camera took a photo as soon as the attached string would break. The result was a series of 12 photos in which 2nd and 3rd photos showed Sallie Gardner's all hooves off the ground. Once again, Muybridge was successful in answering the horse gallop question. But more importantly Muybridge was able to produce the world's first motion picture showing a galloping horse by quickly running these 12 photographs in sequence. Muybridge had actually laid the foundation of modern videography.