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Nautical Almanac tables require looking up two values and adding them to Ha if  a lower limb ,two steps, and an additional step of subtracting 30' if an upper limb, a  total of three steps.

Using the Air Almanac tables requires three steps, refraction correction, semi-diameter correction, and P in A correction, also a total of just three steps!

If using a bubble sextant, or if using a liquid artificial horizon and superimposing the images, the Nautical Almanac tables requires you to 1) look up the main correction and add it to Ha, 2) look up both of the corrections for the lower limb 3)and upper limb, 4)add them together and then 5) divide by two to determine their mean and then 6) add it to the Ha. Whew!

If using a bubble sextant, or if using a liquid artificial horizon and superimposing the images, the Air Almanac tables requires you to do only two steps, refraction correction and P in A correction, no semi-diameter correction necessary because you have measured the altitude of the center of the moon.

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