How many millimeters is the sun?
The sun is not millimeters. It is a G-type star, on the Main Sequence, in mid-life.
For its spectral classification, its size is average, with a diameter of about 1,390,000,000,000 millimeters
While it is certainly possible to calculate the distance from the Sun to the Earth in millimeters, it would be foolish to do so. The use of millimeters as a unit of measurement should be restricted to cases when precision requires it, or when the distances are small. The distance from the Sun to the Earth varies on a moment-by-moment basis, and the "edge" of the Sun itself is indistinct; it would be impossible to…