Speeding light from horizon stopping and turning 90 degrees at high speed and then hovering overhead.

My sister-in-law and niece were together with me in a back farm field (very dark) 5 miles east of the city. A bright light looking like a star moved very quickly from southern horizon approaching us and suddenly stopped directly over our heads -- this took about 1 minute.
It immediately turned 90 degrees and quickly sped away to west at same speed for about 5 seconds. It then came to a sudden stop and hovered clearly visible to us over- head. I checked every hour from 8 PM to midnight but it remained stationary. It remained looking like a star but impossible to determine altitude.
To me as a medical doctor psychiatrist, it is impossible for light to stop and make a 90 degree turn at high speed. We saw no actual craft.
Witness indicates that the date of the sighting is approximate.  PD