GEN TOC
ENR TOC
AD TOC
Index
GEN 2.7 SUNRISE/SUNSET TABLES 1. 1.1 DAYLIGHT AND DARKNESS GRAPHS “Night” is that period between the end of evening civil twilight and the beginning of morning civil twilight. For all intents and purposes, first light should be construed as the beginning of civil twilight, and last light as the end of civil twilight. The terms “sunrise” and “sunset” have no relevance when calculating daylight operating times for the VFR pilot. To compute the beginning or end of daylight using the graphs contained in this section: a. enter the top or bottom of the scale at the appropriate date; b. move vertically up or down to the curve for the latitude of the place concerned (interpolating for intermediate latitudes if necessary); c. move horizontally to the left or right and read local mean time on the vertical scale at the side; d. to convert to UTC, subtract (in E longitudes) from the LMT obtained, the time increment corresponding to the longitude of the place concerned in the “Conversion of Arc to Time” table. e. to convert to EST, add 10 hours to UTC; f. to convert to CST, add 91/2 hours to UTC; g. to convert to WST, add 8 hours to UTC. Example: To determine the end of daylight at Echuca (S36 09.0 E144 46.0) on 20th November. Using the graph, enter at 20th November at the top of the page and follow downwards to latitude 36° (by interpolation), then horizontally to the left and read off LMT = 1919. To convert to UTC, enter the “Conversion of Arc to Time” table, at longitude 144° (9 hours 36 minutes). Add the increment corresponding to 46’ in the right hand column = 3’ 04” + 0936 = 0939. Subtract this from the LMT found: 1919 – 0939 = 0940 UTC. To find EST add 10 hours to UTC=1940 EST. Users of these graphs should note that the parameters used in compiling the Daylight and Darkness Graphs do not include the nature of the terrain surrounding a location, or the presence of GEN (GENERAL) A/L 45 effective 24 NOV 05
1.2
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ENR TOC
AD TOC
Index
GEN 2.7 SUNRISE/SUNSET TABLES 1. 1.1 DAYLIGHT AND DARKNESS GRAPHS “Night” is that period between the end of evening civil twilight and the beginning of morning civil twilight. For all intents and purposes, first light should be construed as the beginning of civil twilight, and last light as the end of civil twilight. The terms “sunrise” and “sunset” have no relevance when calculating daylight operating times for the VFR pilot. To compute the beginning or end of daylight using the graphs contained in this section: a. enter the top or bottom of the scale at the appropriate date; b. move vertically up or down to the curve for the latitude of the place concerned (interpolating for intermediate latitudes if necessary); c. move horizontally to the left or right and read local mean time on the vertical scale at the side; d. to convert to UTC, subtract (in E longitudes) from the LMT obtained, the time increment corresponding to the longitude of the place concerned in the “Conversion of Arc to Time” table. e. to convert to EST, add 10 hours to UTC; f. to convert to CST, add 91/2 hours to UTC; g. to convert to WST, add 8 hours to UTC. Example: To determine the end of daylight at Echuca (S36 09.0 E144 46.0) on 20th November. Using the graph, enter at 20th November at the top of the page and follow downwards to latitude 36° (by interpolation), then horizontally to the left and read off LMT = 1919. To convert to UTC, enter the “Conversion of Arc to Time” table, at longitude 144° (9 hours 36 minutes). Add the increment corresponding to 46’ in the right hand column = 3’ 04” + 0936 = 0939. Subtract this from the LMT found: 1919 – 0939 = 0940 UTC. To find EST add 10 hours to UTC=1940 EST. Users of these graphs should note that the parameters used in compiling the Daylight and Darkness Graphs do not include the nature of the terrain surrounding a location, or the presence of GEN (GENERAL) A/L 45 effective 24 NOV 05
1.2
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