![]() ![]() This lens effect causes the sun's apparent position to differ from its computed position, and this lens effect must be taken into account in predicting a sunrise or sunset as seen by an observer. It is important to note that an observer who views a sunrise or sunset normally is looking through Earth's atmosphere, which has optical properties not unlike a lens. SORTED3 SUNRISE SERIESThis set of computations relies on a number of methods including Fourier series and three-dimensional trigonometry. There are several factors that make this computation somewhat complex, among which are the eccentricity of Earth's orbit and Earth's axial tilt that is responsible for the seasons.Īfter the sun's position relative to the Earth has been computed for a given date, one must then acquire a relative position based on a specified geographical location. Solar position computation relies on a mathematical model of the sun-earth orbital system. Solar Computer is released under the GPL. The data table will then be located on the system clipboard, suitable for pasting into a spreadsheet or database file.Īgain, complete documentation and technical notes for Solar Computer are located here. To copy the generated yearly data table, click on the table display, press Ctrl+A (select all), then Ctrl+C (copy). Optionally generate a data table for an entire year.Compute solar values for the present date.Enter a time zone if the automatically generated zone is not correct.Enter the date of interest if not today.You can also zoom the map in and out, and choose a different location by clicking it.If the above operation fails, or if you want sunrise/sunset times for a location other than your own, enter a geographic location for the place of interest.Wait for the network to compute your location - this might require a few seconds.Your browser may ask to provide your location - say yes. SORTED3 SUNRISE HOW TODetailed documentation is provided below, but for those who want a quick result, here is how to proceed: This is something that should never happen to a computer language, but it does happen, regularly, ultimately disabling any computer programs that are not rewritten over and over again to keep up with arbitrary changes in the language. Also, over time there have been many changes in Java that had the side effect of preventing older programs from running properly. I replaced the old version because many people have requested a more flexible data source that can produce a table of values covering a year, rather than just one day. This version is written in JavaScript and replaces an older Java page (archived here). This version of Solar Computer is the most recent in a series of programs I have written over the years to provide a variety of useful solar computations. Solar Computer provides an easy way to compute sunrise and sunset times, and some other useful values, for any date and geographical location. ![]()
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