* 2010, Denis Farkasfalvy, Inspiration and Interpretation: A Theological Introduction to Sacred Scripture, The Catholic University of America Press (2010), ISBN 9780813217468, page 188:.These firms or businesses are not illegal in the strict sense, but there is a shadowy penumbra within which they live, and it is often convenient for the government to look the other way. (figuratively) An area of uncertainly or intermediacy between two mutually exclusive states or categories.
(astronomy) A region around the edge of a sunspot, darker than the sun's surface but lighter than the middle of the sunspot.The part of the moon that remains in the penumbra receives some direct sunlight, and the glare is usually great enough to prevent your seeing the faint coppery glow of the part of the moon in the umbra. Backman, Horizons: Exploring the Universe, Brooks/Cole (2012), ISBN 9781111430207, page 37: In the boiling temperature of 119 ° F – the hottest they had experienced so far – they watched as the penumbra of Venus blurred its outline at the precise moment the disc crossed the sun. * 2011, Frank McLynn, Captain Cook: Master of the Seas, Yale University Press (2011), ISBN 9780300114218, page 112:.The other places see the penumbra of the moon's shadow fall on the earth, so the eclipse is partial, and part of the sun's disc is still visible. Duree, Jr., Optics for Dummies, Wiley Publishing, Inc. A partially shaded area around the edges of a shadow, especially an eclipse.