= Interferometric angular diameter
{title2=$V(B)=2J_1(\pi B\Theta/\lambda)/(\pi B\Theta/\lambda)$}
An angular diameter inferred from the <interferometric visibility> of an extended source. The displayed monochromatic formula is for a uniformly bright circular disk, with projected baseline $B$, diameter $\Theta$ and wavelength $\lambda$. Its first visibility zero gives $B\Theta/\lambda\simeq1.22$. <Stellar angular diameter from a visibility envelope> describes this calibration; real photospheres require limb-darkening corrections.
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