I have a specialist/specification question that related the geography but more like earth science or weather data namely whether darkness falls quicker in the spring / summer since it appears so where I live, that when days are longer the dusk and dawn also appear somewhat longer. Would this question be on or off-topic, if it's off-topic, can you suggest where I can ask it?
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API's for Weather are good for GIS-SE but for spec see whubers answer – Mapperz♦ May 16 '13 at 15:12