Umbra, penumbra and antumbra (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Umbra, penumbra and antumbra" in English language version.

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nasa.gov

Event Finding Subsystem Preview Navigation and Ancillary Information Facility.

Pogge, Richard. "Lecture 9: Eclipses of the Sun & Moon". Astronomy 161: An Introduction to Solar System Astronomy. Ohio State University. Retrieved July 16, 2015.