Tag Archives: safety

How to make a pinhole projector to safely view the solar eclipse

Materials:

Dark-colored plastic cup
Wax/butter paper
Scissors
Rubber band
Pushpin
a shuttle cork cardboard box (both sides open)
To Do:

Use the pushpin to punch a hole in the center of the cup’s bottom. Cut out a piece of wax paper slightly larger than the cup’s mouth. Stretch this paper across the mouth of the cup. Use a rubber band to secure the paper.
now insert the cup inside the shuttle cork box with the bottom of the cup outside and the side with wax/butter paper inside (see that no light enters from the cup side and there is complete darkness if you see through the other side)
now point the pinhole towards the sun you will see a small dot forming on the butter paper that is the disk of the sun as the eclipse proceeds the sun starts forming a crescent phase

PS NEVER LOOK DIRECTLY TO THE SUN IT DOES NOT MAKE A DIFFERENCE IF ECLIPSE IS ON OR NOT !!!

TOTAL SOLAR ECLIPSE JULY 22nd 2009

Total Solar Eclipse 2009, Amateur Astronomers Association Delhi

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Mark your calendars folks, its surya-grahana time in India again. Come July 2009 the moon will eclipse the sun as seen from India, Bhutan,Bangladesh,China, Japan and the Marshall Islands. Its going to be the longest solar eclipse for over a century and guess what, this time the path of totality passes through India. This eclipse pass over India comes after almost a decade. The last two eclipses happened in 1999 and 1995.

Totality

The eclipse begins on the 22nd of July 2009 at around 5:30 am IST in India and spends almost two hours passing the subcontinent. The path of totality will pass through central India passing over Surat, Ujjain, Baroda, Bhopal, Patna, Darjeeling, and Dibrugarh in the far east. Rest assured the Bohemians will be out there somewhere chasing the eclipse.!!!!



Click to Enlarge

Circumstances of the Eclipse
For a full list of Eclipse circumstances CLICK HERE

Eclipse Safety : Observing Eclipse Do”s and Don”ts

warning Before we go on I must warn you to NEVER EVER look at the sun especially the PARTIAL PHASE through unprotected eyes or homebrewn filtering mechanisms.

The use of homebrewn filters is recommended to seasoned astronomers only who understand the risks involved! There are however very simple ways to observe an eclipse without putting your eyes in harm”s way

One of the simplest method to observe the sun safely is through a pinhole projection camera. This can be used for viewing the partial phases of the eclipse. During totality however, it is perfectly safe to watch the eclipse naked eye.

To learn how to make a pinhole camera CLICK HERE

Alternatively you may use a solar filter
solar filters

The first thing you must remember is that the human eye has no nerve endings, so if you burn your retina, it will not hurt. 😛 , which is all the more reason that caution is advised while observing 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. Even when 99% of the Sun”s surface (the photosphere) is obscured during the partial phases of a solar eclipse. This is primarily because nearing totality the ambient light levels become so less that our pupils dilate and the iris tries to allow in more light into the eye.

During the partial phase any surge in sunlight, like the one seen during a diamond ring formation can cause excessive solar radiation entering the eye and causing a burn on the retina.


In spite of these precautions, the total phase of an eclipse can and should be viewed without any filters whatsoever. The naked eye view of totality is not only completely safe, it is truly breathtaking

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UPDATES

Update: May 29d 2009
AAAD Observation Plans

Update: March 3rd 2009
The Solar Eclipse: Facts, Fiction and Pregnant Women


Update: March 2nd 2009
Average Cloud Cover along the Central Line of the Eclipse