The value of sin 0 is 0. Sin 0 degrees is the value of the sine trigonometric function for an angle equal to 0 degrees. The sine function is a ratio of the length of the opposite side, perpendicular and hypotenuse of the right-angled triangle. On the unit circle, the y-coordinate is the sine of the given angle. Since the angle 0 degrees lies on the positive x-axis, the value of sin 0 degrees is 0.