The longitudes, in whole degrees, are listed vertically to the left of each set. The longitude increments differ in each set. In the top set, the longitudes are listed for every 20 degrees; in the middle set, they are 15 degrees; and in the bottom set, they are 10 degrees.

The time differences, in 5-minute increments, extend across the top of each set. The top set covers time differences from 5 to 30 minutes, the middle set covers from 35 to 60 minutes, and the bottom set covers from 65 to 90 minutes. The time difference determines which set of longitudes you will use.

Use the time difference column that is closest to the time difference obtained from the Moonrise and Moonset table. DO NOT INTERPOLATE. For example, lets say the time difference is 24. Using table 6-8-2, find the column heading closest to 24, which is 25. The time correction is taken from this column. Next, find the longitude in the Longitude column. Remember, use the closest longitude. DO NOT INTERPOLATE. The time correction for longitude is found where the time difference and longitude intersect.

The Conversion of Arc to Time table was covered in Unit 6, Lesson 7; therefore, I will not cover it again here.

Learning Objective: Identify the steps used to compute moonrise and moonset from Air Almanac.

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