The stars are so far away that their angular diameter is extremely small. Why, nevertheless, are stars in visual and photographic observations presented as objects with measurable disks?
The diameter of the observable disk of a star is determined by the width of the zero-order maximum and the scattering of light in a turbid medium – the lens of the eye or photographic emulsion.
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.