Simplified the "Day Duration" calculator module. Actually, while the operation of the module is simplified, its fucntion has been expanded, it now shows data for the Moon as well as the Sun. I'm planning to rename this module to "Daily Almanac"

There is now a "Location" button for choosing a place with the Location Dialog (instead of entering Longitude/Latitude values). As usual, I removed the Compute and Clear buttons, and changing the input data (location or date) automatically updates the output fields.