Thought it was a balloon then realized it was moving horizontally and it made a very precise 90 degree turn

12 year crew chief in the Air Force. Was an aerospace technologies instructor. Have a DJI FPV drone and am familiar with the noise they produce at varying altitudes.
This caught my attention because it maintained a consistent altitude and altered course by 90 degrees in a very precise and deliberate manner. It did not produce any noise. It was as if it was vantablack, couldn’t make out any features other than the general shape and size because it was dark and the object was black.
It looked spherical from a distance. It maintained an approximate altitude of 500 feet. It flew toward me and proceeded over me as I started to record. When flying overhead at aproximately it appeared less spherical and more like a horizontally pitched disc, to the naked eye. It looked to be aproximately 6 feet in width and it traveled at approximately 5-10 mph. It had similar appearances to the declassified navy video of a black orb splashing into the water. I will also note that this particular valley has little to no cell service. I recorded it with low definition on an iPhone 12, then stopped the recording to change my settings to HD with a higher frame rate. By the time I had done so and started recording again, it was gone and I was left looking like ab idiot with a phone in a field.
Disclaimer: I did have the generator for my camper operating, but I can hear my drone at that altitude and location. This thing was substantially larger and made no noise and had no noticeable outlets, exhausts, fans, propellers, or viewable means of propulsion.
It is very possible that it was a man-made blimp-like object, I just haven’t seen anything like it before and it resembled close enough to the craft in the navy video for me to submit this.