To convert millimeters (mm) to astronomical unit (AU, UA), you need to divide the value in millimeters by 1.495978706e+14.
So, to convert 1400 mm to AU, UA:
1400 mm / 1.495978706e+14 = 9.358421971e-12 AU, UA
Therefore, 1400 millimeters is equal to 9.358421971e-12 astronomical unit.
This below table contains list of length units and conversion values:
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