https://creativecommons.org/publicdomain/zero/1.0/https://www.rawpixel.com/image/13965066Edit ImageSaveSaveEditCropCustom TextAstronomy: the open air observatory at Peking. Engraving.Original public domain image from Wellcome CollectionMorePublic DomainFree CC0 image for Personal and Business useInfoView CC0 LicenseJPEGSmall JPEG 1200 x 864 px | 300 dpiLarge JPEG 3132 x 2256 px | 300 dpiFree DownloadAstronomy: the open air observatory at Peking. Engraving.More