According to some scholars, the term evening (twilight) was used differently by the Jews in ancient times, and this is reflected in the OT passage about sacrificing the Passover Lamb. The Passover sacrifice was to be accomplished “in the evening” (as many translations have it) – but more literally the Hebrew text says “between the two evenings”.
The Jews divided the daylight hours into two parts: morning, from sunrise to solar noon, and evening, from noon to sunset. Noon begins the first evening because it is then that the sun begins to decline in the sky. Sunset begins the second evening – that is when twilight begins.
Jesus died ‘between the two evenings’ because He is the Passover Lamb.
The exact time of day for the ninth hour would be the midpoint between solar noon and sunset, which, for that time of year in the spring, would be about 9 minutes before 3 p.m. Jerusalem Standard Time (by our way of tracking the hours)