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Computing moonrise and moonset and percent illumination |
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COMPUTING MOONRISE AND MOONSET AND PERCENT ILLUMINATIONUNIT 6LESSON 8 OVERVIEW Identify the phases of the Moon. Identify the two factors in the Moons orbit that cause daily changes in the time of moonrise and moonset. Identify the source providing specific times of moonrise and moonset. Identify the steps used to compute moonrise and moonset using Air Almanac. Relate the age of the Moon, in days, to the percent illumination available. OUTLINE Phases of the Moon Orbital factors affecting moonrise and moonset Air Almanac Moonrise and moonset computations Lunar percent illumination COMPUTING MOONRISE AND MOONSET The strength of moonlight varies depending on the phase of the Moon and on Earths cloud cover. Because naval operations take place at night as well as during the day, information on the amount of light that the operations will be exposed to becomes important. Although several programs are readily available that calculate Sunrise, Sunset, Moonrise, Moonset, and percent Lunar Illumination, you must know the procedure to calculate these figures using the tables. While the process presented here refers to Air Almanac, the data may also be computed in a similar manner using Nautical Almanac. Learning Objective: Identify the phases of the Moon. |
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