https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13951485Edit ImageSaveSaveEditCropCustom TextAstronomy: a diagram showing how to determine longitude. Coloured engraving by J. Emslie, 1851, after himself.Original public domain image from Wellcome CollectionMorePublic DomainFree CC0 image for Personal and Business useInfoView CC0 LicenseJPEGSmall JPEG 967 x 1200 px | 300 dpiLarge JPEG 2369 x 2939 px | 300 dpiFree DownloadAstronomy: a diagram showing how to determine longitude. Coloured engraving by J. Emslie, 1851, after himself.More