If you have found the educational materials of the https://astro.unl.edu website useful (examples shown below), please consider making a donation to the development effort. It is tax-deductible! Contributions can be made through the UNL Astronomy Education Support Fund at https://nufoundation.org/fund/01164090/ on the University of Nebraska Foundation website.
This fund shall be used to support the wages, benefits, equipment, and travel expenses needed by programmers, web designers, and graphic artists developing content and tools for astronomy education. It is under the direction of:
Dr. Wendy Smith, Director UNL Center for Science, Mathematics, and Computer Education