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antumbra

The umbra, penumbra and antumbra are three distinct parts of a shadow, created by any light source after impinging on an opaque object. Assuming no diffraction, for a collimated beam (such as a point source) of light, only the umbra is cast.
The antumbra (from Latin ante, "before") is the region from which the occluding body appears entirely within the disc of the light source. An observer in this region experiences an annular eclipse, in which a bright ring is visible around the eclipsing body. If the observer moves closer to the light source, the apparent size of the occluding body increases until it causes a full umbra.

Love this eclipse called antumbra

by Antumbra November 20, 2021


carprioception

The ability to know the physical extent of your vehicle, including trim and tires, when parallel parking in very tight spaces.

Hey Rachael, that's some amazing carprioception you've got. Not even a bumper touch getting into that parking space. You made that look like Doris Day Parking.

by Antumbra August 12, 2010