| How to convert Square Millimicrons to Square Astronomical: 1 square millimicron is approximately equal to 4.47e-41 square astronomical. 1 square millimicron ≈ (4.47 * 10-41) ≈ 4.47e-41 square astronomical The areaQ(sa) in square astronomical is equal to the area Q(mm) in square millimicrons multiplied by 4.47e-41. | 
| Formula: Q(sa) ≈ Q(mm) * 4.47e-41 | 
| Square Millimicrons to Square Astronomical conversion table 
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