This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Sundial . Commemotative sundial pamphlet cover image National Institute of Standards and Technology National Institute of Standards and Technology PDUSGovNIST PDUSGov Sundial on the NBS campus Washington
Page 2023 Free-images.com. All images are Public Domain