Zero Shadow Day

Zero Shadow Day
News: Recently, Bengaluru experienced a ‘Zero Shadow Day’, when vertical objects appear to cast no shadow.
About:
 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.

 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.