मंगलवार, जनवरी 19, 2010

Solar Eclipse at IIT Madras


Longest solar eclipse of the century. A lot of time to try quite a few designs. This one has eyes made of the image of the sun through the ordinary reading lens.


A child gave the name 'the kutti sun' (through leaf holes).


Eclipse could be seen throughout the campus through the pin holes of the tree leaves (known as Leaf canopy)[Ref 1]. A reading lens of 1 diopter (the first reading lens one needs at the age of 40 years) can make things pretty bright.  Among many images through leaf-canopy, two bright semi-circles are images of the sun through a reading lens.
[Ref 1: "Forest Cover as a Solar Camera: Penumbral Effects in Plant Canopies" by Margaret C. Anderson and Edward E. Miller, Journal of Applied Ecology, Vol. 11, No. 2 (Aug., 1974), pp. 691-697

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