I had no guest but one I dare not name- 'Tumulum circumvolat umbra.
"Not Pretty, But Precious"
John Hay, et al.
It is bordered on both sides by the spectrum of the penumbra, which is much brighter than that of the umbra, but fainter than that of the adjoining regions of the sun.
"The Story of the Heavens"
Robert Stawell Ball
4 3 34 " " " umbra....................
"Canadian Eclipse Party 1869"
Commander E. D. Ashe