with which they are involved. All features may not be present during each apparition, but there will be enough variety to maintain the serious observer's interest. Patience and attention to detail will enable the observer to gather significant data about the present condition of these currents.

The uniformity of the slow currents is important because bright and dark spots are now known to have opposite circulations, and actually lie on opposite sides of the retrograding jet stream, which are commonly deflected around them. The larger spots are therefore embedded in waves on the retrograding jet streams. The slow-current features observed from Earth are mostly large bright ovals or dark condensations of sizes comparable to the distances between jet streams [81].

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