Here's a simplified timeline:
* 1839: Alexandre Edmond Becquerel observed the photovoltaic effect, the foundation of solar power.
* 1873: Willoughby Smith discovered the photoconductivity of selenium, leading to the first practical solar cells.
* 1905: Albert Einstein's explanation of the photoelectric effect provided the theoretical basis for solar energy.
* 1954: Bell Labs created the first practical silicon solar cell, marking a significant milestone in the development of solar technology.
* 1960s: Solar panels were developed for space applications, further advancing their efficiency.
* 1970s: The oil crisis spurred interest in renewable energy, leading to research and development of solar panels for terrestrial use.
* Present day: Continual improvements in efficiency, materials, and manufacturing processes have made solar panels more affordable and accessible.
So, while a specific "invention day" for solar panels doesn't exist, the development of this technology has been a continuous process spanning over 180 years.
