com.kosherjava:zmanim (maven):  The Zmanim library is an API for a specialized calendar that can calculate different astronomical times including sunrise and sunset and Jewish zmanim or religious times for prayers and other Jewish religious duties. 
Keywords: calendars|daf-yomi|dawn|dusk|hebrew-calendar|hebrew-date|java|jewish|jewish-holidays|judaism|parsha|sunrise|sunset|yahrzeit|zman|zmanim