IPA: //ˌhɛliəˈɡræfɪk//
KK: /hɛliəˈgræfɪk/
Related to a method of recording images using sunlight or the sun's rays.
The scientist used a heliographic technique to capture the solar images.
Heliographic → It is formed from "helios" (ἥλιος) (meaning sun) and "graphia" (γραφή) (meaning writing or representation). The word refers to the representation or writing of the sun, often in the context of photography or mapping using sunlight.
Think of 'helios' meaning sun and 'graphia' meaning writing — this helps you remember that heliographic relates to writing or representing the sun.