Step 1. Locate the day in the daily pages of Air Almanac.  

Step 2. Enter the Moonrise and Moonset table with the latitude of the location for which you are determining moonrise and moonset and read the time and time differential. Interpolate when necessary.

Step 3. Determine the time correction from the Interpolation of Moonrise, Moonset for Longitude table.

Step 4. Apply the time correction obtained in step 3 to the time obtained in step 2. This is the time of moonrise/moonset LMT.

Step 5. Convert LMT to Local Standard Time (LST) using the Conversion of Arc to Time table.

Example: Compute moonrise on 4 August 1989, at 3021N 8719W.

Step 1. Use the daily page for 4 August 1989 (table 6-8-1).

Step 2. Determine the time and time differen-tial at 3021N from the Moonrise table. 3021N rounds off to 30N; 30N = 07:50 LMT; and the time difference equals 28 minutes.

Step 3. Determine the time correction for longitude 8719W. Use table 6-8-2. The longitude in the table closest to 8719W is 80, and the time difference closest to 28 is 30. The time correction is 11 minutes.

Step 4. Add 11 minutes to 07:50 LMT (07:50 + :11 = 07:61 = 08:01 LMT).

Step 5. Convert 08:01 LMT to LST using table 6-7-2.

Have your immediate supervisor or leading chief answer any questions you may have, and then have one of them check your computations.

Learning Objective: Relate the age of the Moon, in days, to the percent illumination available.

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