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How to Safely Watch a Solar Eclipse

from we-are-star-stuff.tumblr.com (19 February, 2017):

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An annular solar eclipse will occur on Sunday 26 February, 2017 UT, lasting from 12:10–17:36 UT. It will be seen from southern South America, across the Atlantic, and into southern Africa.

The only time that the Sun can be viewed safely with the naked eye is during a total eclipse, when the Moon completely covers the disk of the Sun. It is never safe to look at a partial or annular eclipse, or the partial phases of a total solar eclipse, without the proper equipment and techniques. Projecting the Sun through a box projector, or using binoculars or a telescope, or simply 2 pieces of card is a safe and easy way to view a solar eclipse.

Card Projector

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  1. Take a sheet of paper and make a very small hole in the middle of it using a pin or a thumbtack. Make sure that the hole is round and smooth.

  2. With your back towards the Sun, hold 1 piece of paper above your shoulder allowing the Sun to shine on the paper.

  3. The second sheet of paper will act as a screen. Hold it at a distance, and you will see an inverted image of the Sun projected on the paper screen through the pinhole.

Projector Using a Box

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  1. Cut a rectangular hole at the end of a cardboard box. The longer the box, the larger the projected image.

  2. Cut out a piece of aluminum foil slightly larger than the rectangular hole. Make sure it is completely flat and not crinkled. Tape the foil over the rectangular hole you just made in the box.

  3. Use a pin to poke a tiny hole in the center of the foil.

  4. Place a sheet of paper on the inside of the other end of the box.

  5. Stand with your back towards the Sun. Place the box over your head with the hole towards the Sun. Adjust your position until you see the Sun’s image reflected on the paper inside the box.

If you are using a tube, cut the end of the tubes and tape the foil with a pinhole on one end. On the other end, tape a piece of white paper over the end of the tube. This will act as the screen. Close to this end, cut a rectangular hole using the knife. This will be your viewing window.

With your back towards the Sun, point the end with the foil towards the Sun, angling the tube along the Sun’s rays. Look into the tube through the viewing window and you will see a small projection – a negative image – of the eclipsed Sun on the screen.

Binoculars/Telescope Projector

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  1. Put the binoculars or the telescope on a tripod. Make sure that it is steady.

  2. Trace the lenses of the telescope or binoculars on a piece of cardboard, and cut out the holes. Tape the cardboard in front of the binoculars or the telescope so that the lenses stick out of the holes. If there are any holes or spaces between the cardboard sheet and the lenses, cover them with duct tape.
  3. Direct the binoculars towards the Sun without looking at the Sun directly.

  4. Place the sheet of the paper at a distance behind the eyepiece.

  5. It may take a few trials before you can get the best position for the binoculars. After this, the Sun’s image will be projected on the paper.

Happy watching! [x]

Reposted frommr-absentia mr-absentia

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