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OSC Calibrator and High-Voltage Fuse Resetter for 8-Pin ATtinys
analysis of video meteor spectra
Calibrate your monitor from the command line using ArgyllCMS .
Camera calibration based on the open-source project - easy3D: https://github.com/LiangliangNan/Easy3D.
homemade telescope: Dobson ALT-AZ control, solve and goto + equatorial table
calibration of meteor spectra with laser or spectral lamp