Abstract
This study outlines the calibration of five solar pyranometers following ISO 9847 standards to improve the accuracy of solar irradiance measurements. The calibration process involved data collection, consistency checks, and calculations to determine calibration factors. Post-calibration results demonstrated reduced systematic errors and more accurate irradiance readings. The resulting data set reports on the entire calibration process, including pre- and post-calibration irradiance measurements, which enhances the reliability of solar energy measurements for future applications. The calibrated pyranometers were then used to measure vertical, horizontal, and ground-reflected solar irradiance, including diffuse radiation.