Along the equator, it was no-shadow-noon on September 22 ( Autumnal Equinox). When do you expect this right-above-head-Sun noon, at Bangalore, India? The latitude of Bangalore is #12.98^o N#.

Question

Claire Anctil · Accepted Answer

May 1 and August 2, 2017.

We have no-shadow noon when, when the Sun is right overhead. It happens at equator, on an equinox day. At the equator, the spacing in between successive no-shadow-noon days is nearly six months. Elsewhere, it is not equispaced. North or South, there is no no-shadow noon for latitudes greater than #23.44^o# At summer solstice, this latitude limit is reached at 23.44^o N and, at winter solstice, this limit is 23.44^o S. In brief, there could be no-shadow noon, for #latitudes in (23.44^o S, 23.44^o N)#. In 2017, vernal equinox will be on March 20 and summer solstice on June 21. This period is 93 days.During this period, the latitude for our event increases, from 0 to #23.44^o N# The latitude of Bangalore is #12.98^o N# So, my expectation is on just after#((23.44-12.98)/23.44) X 93=41.5# days, from March, 20. This day is about May 1, 2017.. The next one would be equidistant, after summer solstice, on about August 2, 2017.. . .

Luca de · Answer

undefined In Bangalore, India, the right-above-head Sun noon falls on roughly March 21, the Vernal Equinox, and September 23, the Autumnal Equinox.