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Orientation of Charts
Regardless of what kind of chart you are using, the position of the variable changes relative to the horizon as the earth rotates, and the chart must be held according to the following rules: - Face the directin in which the distance from the variable to the horizon is smallest.
- Hold the chart up over your head next to the variable star.
- With regular "b" scale and deeper charts, rotate the chart so that South is pointing toward Polaris. (In the Southern Hemisphere, point North toward the South Celestial Pole.) When using an "a" scale chart or a "reversed" chart, point North toward Polaris.
- Bring the chart down to a comfortable working position without changing its orientation.
Northern Hemisphere
Southern Hemisphere
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