![]() These can be determined by drawing straight lines between the sun as the light source, and the moon as the occluding object. These names are most often used for the shadows cast by celestial bodies, though they are sometimes used to describe levels, such as in sunspots. ![]() ![]() Assuming no diffraction, for a collimated beam of light, only the umbra is cast. And if they are in the antumbra, they will observe an annular solar eclipse. The umbra, penumbra and antumbra are three distinct parts of a shadow, created by any light source after impinging on an opaque object. If they are in the penumbra, a partial eclipse occurs. In the case of a solar eclipse, if an observer is inside the umbra, then a total solar eclipse occurs. And these also apply to all objects, not just the Sun, Earth, & Moon. These apply to all shadow, not only in the case of eclipses. Method for the Calculation of Spacecraft Umbra and Penumbra Shadow Terminator Points. And in the antumbra, they will see the occluding object obstructs the inner part of the light source. In the penumbra, they will see a part of the light source blocked. In the shadow’s umbra, an observer will see the entire light source obstructs the occluding object. In reality, the lines are there only to determine the boundaries of the shadow’s regions in an eclipse diagram. We can use this property of light to determine the umbra, penumbra, and antumbra part of a shadow by drawing lines from the edges of the light source toward and past that of the occluding object.įlat-Earthers regard the lines in an eclipse diagram as a violation of the fact that a light source emits light in every direction. , ' Calculating Satellite Umbra / Penumbra Entry and Exit Positions and Times, ' The Journal of Astronautical Sciences, 39 ( 4 ), 411-422. Light generally travels in a straight line.
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