On Development of SunSketcher: A Heliophysics Citizen Science Project

The SunSketcher project harnesses the collective power of citizen science to advance solar physics through precise measurements of solar oblateness. This initiative builds upon the success of the Eclipse Megamovie project, leveraging high-resolution lunar surface maps and modern mobile imaging technologies to enhance data accuracy during solar eclipses. By supporting both Android and iOS platforms, SunSketcher ensures broad public participation and inclusivity, enabling volunteers to capture critical observations during the April 2024 total solar eclipse. This paper outlines the technical foundation and development process of the SunSketcher application, emphasizing its integration of advanced image processing techniques, cross-platform compatibility, and collaboration with key lunar and solar datasets. We also detail the iterative development phases, including beta testing outcomes and interdisciplinary team coordination, which were instrumental in achieving feature parity and usability across mobile devices. Furthermore, we discuss the scientific implications of SunSketcher's data collection approach, which contributes to ongoing research in heliophysics and gravitational theory.