Ciclope Planetarium is a web-based planetarium that provides a simulation of the sky from any location at any time and date. Developed using Google Maps API & AJAX. Available in PHP & J2EE. Integrated in the Ciclope Stars project (www.ciclope.info/stars)
Clavius allows developers to augment their applications with an accurate Gregorian calendar/time library. Clavius allows applications to record date and time in coordinated universal time. Clavius supports varying time zones and date format endianness.