A Solar Observatory
When observing the projected image of the Sun it is essential to exclude extraneous light in order to increase the contrast. When I first started regular solar work in 1969, I used a projection box attached to the eyepiece of a 75 mm (3 in) refractor. I obtained good results in favourable weather conditions but accurate positional work was impossible when the box was shaken by strong winds.
KeywordsSolar Observatory Wooden Frame Lower Ring Window Frame Favourable Weather Condition
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