The sunspot diameter is 30,000 km. Can it be seen from Earth with the naked eye? The resolution of the eye is 1 ‘.

Let us introduce the designations: D is the diameter of the Sun, d is the diameter of a sunspot, pc = 30 ‘is the apparent angular diameter of the Sun, p (n) is the apparent angular diameter of a sunspot.
Decision:
D / d = p (c) / p (n); p (n) = d * p (c) / D = 30,000 * 30 / 1.4 * 10 ^ 6 = 0.642.
Since the angular dimensions of the spot are less than 1 ‘, we will not be able to see it.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.