Tools and instruments in the sky

IAU Public Licensing Policy on the usage of images, videos and web texts — https://www.iau.org/IAU/IAU/Copyright.aspx?hkey=1faca2e1-14e3-4b49-833f-81ea3097ef9c Retrieved 19 October 2026; page SHA-256 b5fe8c4cc4fea907da7bda00dffc11104ff504a4005a7d955e0dbfeb875ad405. The images, videos and web texts on iau.org are released under the Creative Commons Attribution 4.0 International license and may on a non-exclusive basis be reproduced without fee, on the conditions outlined below. The full image, footage or web text credit must be presented in a clear and readable manner to all users, with the wording unaltered (for example: "IAU". The credit should not be hidden or disassociated from the image footage. Links should be active if the credit is online. See the copyright Q&A section on this page for guidance. Note that this general permission does not extend to use of the IAU's logo , which shall remain protected and may not be used or reproduced without prior and individual written consent of the IAU. We welcome and encourage the use of our images, videos, and texts. In return, we ask for a common-sense approach to attribution: credits must be clear, highly visible, and positioned directly alongside the material. I want to use the footage in a YouTube video. Is it OK just to put the credit in the text description that appears next to the video? A: No, as this is hidden inside a tab. Also it is not visible if the video is embedded in another website. Please include the full credit ‘burned in’ or overlaid on the video, or clearly visible as a credit at the end. I am a producer for a TV programme and wish to use your images and footage. Do I need to overlay the credit on the image? A: You do not need to, provided the credit is clearly visible and reproduced in full at the end of the programme. IAU constellation charts page (https://www.iau.org/IAU/IAU/Astronomy-FAQs/Constellations.aspx?hkey=bb9dc841-0618-41b5-ac70-149741062141): “The images are released under the Creative Commons Attribution 4.0 International license.”

Each chart is the Wikimedia Commons file of the IAU / Sky & Telescope chart (per-file Commons grant CC BY 3.0, three files CC BY 4.0), shown as Commons' 960px PNG rendering cropped to a square that excludes the chart legend and the IAU and Sky & Telescope logos, which are never reproduced. Credit: IAU and Sky & Telescope magazine (Roger Sinnott & Rick Fienberg).