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3. Stellarium (The Offline King)

TFOV

The FOV calculator’s primary job is to compute using one of two standard formulas:

• FOV_deg = 2 * (180/π) * atan(sensor_mm / (2 * focal_mm))
• focal_mm = sensor_mm / (2 * tan(FOV_deg * π/180 / 2))
• plate_arcsec_per_px = (206265 * pixel_size_mm) / focal_mm