Safe Methods of Eclipse Observation
How to View Solar Eclipse :
The Sun sends many kinds of radiation towards us. Visible light that we see around us is just a small part of the spectrum. A major part is also made up by heat or infrared radiation. The light and heat entering out eyes from the Sun, get focused by the optic lens on the retina, which has sensory cells. On looking at the sun directly without a filter, the focused heat is intense enough to burn our retinas, which can lead to permanent blindness. The danger is increased by the fact that our eyes don’t have pain receptors, and hence cannot even feel the retina burning, which takes away our chances of being aware of the effect of un-safe solar observation.
Hence to mitigate the effects, one needs to pass the sun’s light and heat through an appropriate filter which can absorb the heat, allowing only negligible amount of it to pass through, making solar observation safe. In the case of unavailability of filter, there are indirect methods to observe the Sun too. Solar Filters are used to reduce the visible and Infra-Red Rays of Sun which can damage the eyes permanently. There are many kind of Solar Filter available in the International Market depending upon the degree of intensity. These films are used for various purposes like Photography, Viewing etc. Some methods are discussed below:
Through Image Projection Techniques:
The image of sun is projected through a telescope to the screen which can be viewed by a group of people standing on the opposite side to the screen. Alignment of the telescope is done using shortest shadow method.
Use of safe Sun View Goggles:
Wear Solar Viewer which has mylar or carbon polymer sheet on it to view the Sun safely.
Gnomon Astrotech Pvt. Ltd. Manufactures a Solar View goggle specially to view Solar Eclipse which is the safest way to view the Solar Eclipse. One can wear the goggle as a normal sun glass and see the most spectacular phenomenon of the Universe
It is manufactured by using the world’s most effective Solar Filter Film manufactured in USA and is certified for its Safety Standards by British Standards Institution. This film can reduce the intensity of sun to 98% which is totally safe to view Sun.
Telescopes can be fitted with tight solar filters on the objective to cut off visible and infra-red rays of the Sun, so that the image on the eyepiece is safe for direct observation.
One of the most common methods of eclipse observation is pin-hole projector. It is just what it sounds. A pin-hole, though which the light from a source passes and forms an image on the screen placed on the other side, Pin holes can be designed in various ways, but are simply two screens, with one of them having a pin-hole in it. The screen with pin-hole is the first that faces the source. The distance between the two screens is changed to change the size and focus of the image,
It is not advised to view Sun naked Eyed. While Viewing Total Solar Eclipse, during the totality when the Moon covers the Sun fully, rays are abandoned for few seconds and Pupil of our eyes expands fully to gather more light and suddenly after few seconds when the moon passes away from the periphery of the sun, sun rays suddenly fall on our eyes and the expanded Pupil is exposed fully to the Infra-Red sun rays. Our eyes cannot adjust to the sudden increase in light intensity and the
infra-red Rays can cause permanent damage to our eyes.