Recently, Bengaluru experienced a ‘Zero Shadow Day’, when vertical objects appear to cast no shadow.
About Zero Shadow Day:
What it is? It is a sub-solar point where the sun is directly overhead at a particular latitude.
When the sun is at the zenith (the highest point in the sky) its rays will be hitting a particular point exactly perpendicular to the surface.
This will make the shadow of a person exactly under him, making it look like there are no shadows.
When does it occur?
There are two zero shadow days every year in May and July/August, observed in places that lie between the tropic of Cancer and the tropic of Capricorn.
One falls during the Uttarayan (when the Sun moves northwards), and the other is during Dakshinayan (when the Sun moves southwards).
It lasts for a small part of a second, but the effect can be seen for a minute to a minute-and-a-half.
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