Mathematically, the circle defined by equations x = sint and y = cost in rectangular coordinate system, with the increase of t value, the line segment represented is drawn clockwise. The counterclockwise direction is just the opposite of the clockwise direction.
Running counterclockwise refers to moving in the opposite direction of clockwise, which can be considered as going down from the upper left, then turning right and returning to the top. That is to say, the counterclockwise direction is the opposite direction of the clockwise direction, and it is also the result of mirror image transformation, so the opposite direction of the counterclockwise direction is the clockwise direction.
Extended data:
The reason why the hour hand rotates clockwise stems from its predecessor, the sundial. The hour hand first appeared in the northern hemisphere, and its function is similar to the "shadow pointer" projected by the sundial on the ground. The sun rises in the east and sets in the west, and its shadow on the sundial runs in the opposite direction, from west to east, so the numbers representing time on the sundial are arranged in this way, and the numbers on the surface of modern clocks follow this arrangement.
Baidu encyclopedia-clockwise
Scientific calculators can be rolled back because most scientific calculators have a rollback function. The rollback function allows the user to un