delta Posted 4 January , 2004 Share Posted 4 January , 2004 Does any one have details of how how I can fidn out the time of first light , dawn, sunset and last light, for a particular day during WW1 Link to comment Share on other sites More sharing options...
Terry_Reeves Posted 4 January , 2004 Share Posted 4 January , 2004 Delta The Field Service Pocket Book 1914 (ammended to 1916) gives the times of sunrise and sunset, local time, for certain dates throughout the year for latitudes between 60 degrees North and 40 degrees South. These are given for the 1st and 16th of each month. Times for intermediate dates, according to the instructions, "can easily be interpolated". No doubt somebody will be able to explain how. The publication also gives dates of the full moon 1914-1916. A reprint of this is available from Naval and Military Press, but I'm not sure if this is the 1914 version or the ammended one. If you have difficulties, e-mail me your postal address I will send you a photocopy Terry Reeves Link to comment Share on other sites More sharing options...
Clive Maier Posted 4 January , 2004 Share Posted 4 January , 2004 There are lots of calculators for this. If you run a Google search for sunrise +calculate you will find quite a few. Most let you enter latitude and longitude to get the times at a specific location. You will need to know whether any form of time-shifting was in force at the place and time you are interested in. Link to comment Share on other sites More sharing options...
Terry_Reeves Posted 4 January , 2004 Share Posted 4 January , 2004 Clive's source is likely to be easier than mine to use. You will however need to know both latitude and longditude. These can be found by typing Heavens Above into your search engine. Using Google select the page below the main entry titled "select country",. This will save you the rigmarole of logging on ect. If the name you type in doesn't come up, find and enter the nearest large town and click on "neighbours." Terry Reeves Link to comment Share on other sites More sharing options...
Clive Maier Posted 4 January , 2004 Share Posted 4 January , 2004 I am not sure how reliable those calculators are when you go back as far as the Great War. The ones I tried accepted 1916 without complaint and returned results. However, one of the programs I looked at included the proviso that it was accurate for the “latter half of the 20th Century”. All the programs seem to be based on the same algorithm and the same US Navy data, so all must be suspect for Great War purposes. The error is probably only a few minutes though, and that may not matter too much. It should be possible to get sunrise/sunset figures from contemporary newspapers or almanacs. These could be used to check and calibrate the program results. Then you can use the programs with some confidence to predict times for a given location back in the Great War period. Link to comment Share on other sites More sharing options...
Howard Posted 11 January , 2004 Share Posted 11 January , 2004 If you like doing sums, you could use the details on http://williams.best.vwh.net/sunrise_sunset_algorithm.htm It is a page from Ed Williams Aviation Formulary Howard Link to comment Share on other sites More sharing options...
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