. The aviation pocket-book for 1918; a compendium of modern practice and a collection of useful notes, formulae, rules, tables and data relating to aeronautics . <0 ^ ?si o gging asjq -j l3^^ n33au39 30M3a3Jjia ¥o(f Prediction Chart. 252 METEOROLOGICAL DATA [div. IX. DIV. ix] TIME OF SUNSET 253 The chart opposite gives a diagrammatic representation of thetime of sunset and sunrise at Greenwich. The shaded area betweenthe curved lines indicates the portions of each day during the yearthroughout which darkness prevails. One hour after sunset andone hour before sunrise are indicated b\ the end
. The aviation pocket-book for 1918; a compendium of modern practice and a collection of useful notes, formulae, rules, tables and data relating to aeronautics . <0 ^ ?si o gging asjq -j l3^^ n33au39 30M3a3Jjia ¥o(f Prediction Chart. 252 METEOROLOGICAL DATA [div. IX. DIV. ix] TIME OF SUNSET 253 The chart opposite gives a diagrammatic representation of thetime of sunset and sunrise at Greenwich. The shaded area betweenthe curved lines indicates the portions of each day during the yearthroughout which darkness prevails. One hour after sunset andone hour before sunrise are indicated b\ the ends of the shortshading lines. Tables giving times of sun and moon rising andsetting will be found directly after the title page of this book. Time of Sunset A correction has to be made to tables giving the time of sunset atGreenwich, to obtain the true time of sunset in other parts of GreatBritain. The variations are as follows :— For each degree of longitude west of London add 4 minutes, foreach degree east deduct 4 minutes. In addition to this constantfigure there is a variation depending upon the period of the yearfor places north or south of Greenwich, thus :— March, September - - - A slight difference only. April, October - - - About 2 minutee a degree.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectaeronautics, bookyear
