On January 3, 2026, Earth reached perihelion, its closest point to the Sun, approximately 147 million kilometers away. This proximity, while increasing solar intensity slightly, does not cause heatwaves as Earth's seasons are determined by its axial tilt. The event coincided with the Wolf Moon supermoon and the peak of the Quadrantid meteor shower, offering celestial spectacles. For NASA, perihelion is important for instrument calibration and solar radiation studies.