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Large partial solar eclipse March 20
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<blockquote data-quote="Binastro" data-source="post: 3178510" data-attributes="member: 111403"><p>.. Hi Samandag,</p><p>. Thank you for posting the photographs, I don't know how to do this.</p><p></p><p>The first photograph, in black-and-white, shows some dangerous viewing.</p><p>The man on the right has no protection at all. The two girls have one welders glass, which may or may not be dark enough. It is impossible for two viewers to protect themselves at the same time, as one would be seeing the sun without protection.</p><p>The woman on the left may be using a black-and-white fully exposed negative, which contains silver and does give some protection. Colour film does not.</p><p></p><p>There's a nice photograph of the boy and his dog wearing goggles, but where are the goggles for the livestock? <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p></p><p>The cardboard box on top of somebody's head has to contain a carefully attached welders glass 14 or at a pinch welders glass 13. People should not think that just having a hole in the cardboard box works, as then you are viewing the sun completely unprotected.</p><p></p><p>The photograph with the herring gull? Shows the person using a smaller welders glass, hopefully shade 14.</p><p>If, as in Britain, it is difficult to get shade 14, a welders glass 13 is okay for short periods, but you should try to get the welders glass that is longer vertically, so that you can tilt it to increase the density to the correct shade. Of course you should not tilt it in the direction to reduce the sideways size, i.e. it should fully cover both your eyes.</p><p></p><p>Still almost no sunspots today. A few minutes ago in white light I saw one small sunspot lower right with a properly filtered small instrument.</p><p></p><p>At 0932 UTC this morning in the H Alpha telescope, there was a beautiful double prominence. A large bright mushroom prominence connected to a large bright arch prominence at the 3.30 position inverted altazimuth view.</p><p>There was quite a lot of activity on the sun's disc, filaments and bright areas.</p></blockquote><p></p>
[QUOTE="Binastro, post: 3178510, member: 111403"] .. Hi Samandag, . Thank you for posting the photographs, I don't know how to do this. The first photograph, in black-and-white, shows some dangerous viewing. The man on the right has no protection at all. The two girls have one welders glass, which may or may not be dark enough. It is impossible for two viewers to protect themselves at the same time, as one would be seeing the sun without protection. The woman on the left may be using a black-and-white fully exposed negative, which contains silver and does give some protection. Colour film does not. There's a nice photograph of the boy and his dog wearing goggles, but where are the goggles for the livestock? :-) The cardboard box on top of somebody's head has to contain a carefully attached welders glass 14 or at a pinch welders glass 13. People should not think that just having a hole in the cardboard box works, as then you are viewing the sun completely unprotected. The photograph with the herring gull? Shows the person using a smaller welders glass, hopefully shade 14. If, as in Britain, it is difficult to get shade 14, a welders glass 13 is okay for short periods, but you should try to get the welders glass that is longer vertically, so that you can tilt it to increase the density to the correct shade. Of course you should not tilt it in the direction to reduce the sideways size, i.e. it should fully cover both your eyes. Still almost no sunspots today. A few minutes ago in white light I saw one small sunspot lower right with a properly filtered small instrument. At 0932 UTC this morning in the H Alpha telescope, there was a beautiful double prominence. A large bright mushroom prominence connected to a large bright arch prominence at the 3.30 position inverted altazimuth view. There was quite a lot of activity on the sun's disc, filaments and bright areas. [/QUOTE]
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Large partial solar eclipse March 20
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