👉 In astronomy, photoheliography refers to the study of images formed by light reflected off a moving object or body. This is an area of research that investigates how stars and planets are observed through the atmosphere of other celestial objects. The field of photoheliography was developed in the 1970s by researchers at Harvard University, led by astronomer Robert M. R. Dreyfus. The goal was to understand how light from distant stars is reflected back onto Earth or