= Aperture Photometry Tool
{wiki=Aperture_Photometry_Tool}
The Aperture Photometry Tool (APT) is a software application commonly used in astronomy for the purpose of measuring the brightness of celestial objects in images. It employs aperture photometry, a technique that involves summing the pixel values in a defined circular region (the aperture) around a star or other astronomical object, while also measuring the background light in an annular region outside the aperture.
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