The use of filters that thread into standard eyepieces, available from most astronomical equipment suppliers, will enhance the appearance of details in the atmospheres of Venus, Jupiter and Saturn. Although cloud-covered Venus shows very little in the way of distinguishing features, a deep blue filter can sometimes bring out vague, slightly darker areas that reveal occasional irregularities along the terminator. For Jupiter, the boundary between belts and zones is sharpened by the use of a light blue filter; the appearance of festoons in the zones is enhanced with a yellow one. A light blue filter enhances the delicate contrast between Saturn's belts and zones.
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