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tobagojo — Eclipse by pin-hole (21 Aug 2017) by-nc-sa

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Published: 2017-08-21 23:49:50 +0000 UTC; Views: 125; Favourites: 0; Downloads: 0
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Description Eclipse by pin-hole
Partial solar eclipse (21st August 2017) seen by pin-hole lens - From San Fernando, Trinidad, TT, WI - 20170821
Note: The pin-hole inverts the image.
A mini science project.

Improvisation.

  With no protective goggles available, and with the tropical sun blazing contented and mightily overhead, couldn’t see a thing! A copy-book was placed on the ground in the bright sunlight, at around the time of maximum solar eclipse at San Fernando, Trinidad, TT.

  A thin sheet of cardboard (Bristol-board card) with a pin-hole (made with a fine needle) was held over the copy book, so that the inverted image of the sun (at eclipse) appeared at an appropriate size (not much leeway there!) and in a convenient place on the copybook; then a photograph was taken of the shadows on the copy-book.

  The fun of comparing notes from those obtained in practice, with those estimated by calculation; can be traced by following the arrows from the original copy-book eclipse image.

  True North was estimated (don't have a compass, sorry!) and marked on the picture in 'green'. The image of the eclipse on the copy-book was enlarged; then placed to the right of the image with the 'green true North' inverted (because pin-holes invert).

  The enlarged eclipse image was then rotated so that the 'green North' matched with the 'pink North' orientation of the expected eclipse as displayed by the computations for the location of San Fernando, Trinidad, by the remarkable "Google interactive map by Xavier M Jubier ".  


  Oh well, it's pretty close; my North must be a bit out! Must get a compass.
  But all fiddlestick photo-alignments and mini science project manipulations aside; I did capture and ‘see’ the 21st August 2017 eclipse. That was just cool, wow!

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