We can measure the area of a sunspot in thousands or millions of km, but this area is best expressed in "millionths of the hemisphere solar" (MH), so 1 MH corresponds to the visible area of the Sun (half its total area) divided by 1,000,000. We can also interpret MH as a percentage. In this case, 1 MH corresponds to 0.0001% of the total area of the Sun's visible hemisphere. For example, the biggest sunspot on record to date occurred in April 1947. It reached about 6,000 MH. le: solar hemisphere area. Calculate in terms of "Jupiter's Hemispheres" (HJ) the size reached by this 1947 sunspot. Data: Sun's Radius RSun = 6.96 x 108 m Jupiter's Radius Rjup = 7.15 x 107 m