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The meaning of penumbra is nearly a shadow, and on the other hand, the meaning of umbra is shadow.The idea of penumbra was first developed in 1604, but the umbra was observed recently in 1950.Main Differences Between Penumbra and Umbra As the shading moves forward towards the light portion, the shadow starts becoming lighter and then disappears. When we are shading a picture of an object, the inner portion of the nearest interior portion of an object is the darkest. In painting, the shading part has the concept of the umbra. Umbra is considered a part of the penumbra. It is situated in the middle of the whole shadow portion. The color density of the umbra is the highest among the three parts of a shadow. The name umbra is derived from a Latin word meaning shadow. So it is also called the penumbra lunar eclipse. But during half lunar eclipse or partial lunar eclipse, the umbra partially covers the moon, and at that time, the penumbra is observed. This means that the umbra covers the moon completely.
UMBRA VS PENUMBRA FULL
When a full lunar eclipse occurs, the shadow of the inner earth completely covers the moon. This term is normally used for celestial bodies. The term penumbra is often used in astronomy to make one understand the logic of the eclipses. The different parts of shadow were unknown at that time. At that that the whole shadow is called the penumbra. Penumbra is normally formed and observed during the eclipse. Penumbra is derived from the Latin word paene, meaning almost or nearly. Penumbra is the term given to the shadow formed by the heavenly objects. It is formed in the perimeter of the umbra. Parameters of Comparison Penumbra Umbra First used in 1604 1950 Meaning Nearly a shadow or almost a shadow Shadow Color of shadow Lighter in color than the umbra Darkest portion of the shadow Position On the perimeters of the shadow area At the center of the whole shadow portion During eclipse Becomes larger Becomes smaller What is Penumbra?