Via Prof. Prem B. Bisht लेबलों वाले संदेश दिखाए जा रहे हैं. सभी संदेश दिखाएं
Via Prof. Prem B. Bisht लेबलों वाले संदेश दिखाए जा रहे हैं. सभी संदेश दिखाएं

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