Annotate Solar Images with a Scaled Earth Overlay a correctly scaled Earth on your solar imagesUpload a solar image and overlay a correctly scaled Earth to show how large the Earth is compared to the Sun. The Earth size is calculated from your imaging equipment's plate scale and the Sun's apparent diameter on your observation date. Plate Scale: (Pixel Size / Focal Length) × 206.265 × Binning
Upload a solar image below. Once loaded, the Earth overlay will appear at the calculated size. Drag it to any position on the image to compare the size of the Earth with the Sun.