Over its sidereal period, what is the approximate maximum northern declination the Moon reaches?
Answer
$+28.5^\circ$.
The text specifies the range within which the Moon’s declination varies during its orbital cycle. The Moon's angular distance from the celestial equator swings between a maximum southern point and a maximum northern point. This maximum northern point is stated to be approximately $+28.5^ ext{circ}$ (and correspondingly, $-28.5^ ext{circ}$ to the south). This specific value is crucial because it is used in conjunction with the observer's latitude to determine visibility thresholds. For example, it is subtracted from $90^ ext{circ}$ to find the $61.5^ ext{circ}$ latitude above which continuous absence periods can occur.
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