Bengaluru to observe ‘Zero Shadow Day’ today: Time, duration and other details
In Bengaluru, Zero Shadow Day will be observed on April 25 and August 18.
Tomorrow 25/04/2023 we are going to observe the Zero Shadow Day. Sun will be directly overhead in Bangalore at Noon. If we have Vertical reference such as a pole, at 12:17pm Sun will be overhead and as a result there will be no shadow of the reference pole. pic.twitter.com/bqOGCSWdjO
— ASSOCIATION OF BANGALORE AMATEUR ASTRONOMERS(ABAA) (@abaaonline) April 24, 2023
Why does it occur?
The rotational axis of the Earth is inclined at 23.5 degrees to the plane of revolution of the planet around the Sun which causes different seasons to occur.
This also means that the Sun's highest point of the day moves from 23.5 degrees south to 23.5 degrees north of the celestial equator (called Uttarayan), and it goes back again (called Dakshinayan), in a year.
Thus, in the regions between latitudes 23.5 degrees north and 23.5 degrees south, the declination of the Sun becomes equal to their latitude twice in a year causing the event to occur.
How long does Zero Shadow Day last?
Zero Shadow Day will last only for a fraction of a second, but its effect will be seen for up to a minute and a half.
First Published: Apr 25, 2023 10:57 AM IST
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