HEATKEYS

This site includes lots of information that is time and date related, such as yearly and monthly calendars, countdown counters and the world clock which shows current time in cities all over the world.

Ed Williams

The Astronomical Applications Departmentof the U.S. Naval Observatory computes, from fundamental astronomicalreference data, the position, brightness, and other observablecharacteristics of celestial bodies, as well as the circumstancesof astronomica...

SunriseSunset.com provides a free service that creates a custom calendar with sunrise, sunset and twilight times for any location around the world.

The NOAA Earth System Research Laboratory was formed to observe and understand the Earth system and to develop products, through a commitment to research that will advance the National Oceanic and Atmopsheric Administration

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Features collections of free to use online javascript calculators for astronomy, geometry, trigonometry, algebra, and many other areas. Also, available is free source code written in C and C++ for PC-DOS and Microsoft Windows, shareware that can be d...

Open Source Tutorials: Postfix, Linux Tips, C, C++, cfengine, Bash

A little online application with interactive map that shows sun movement and sunlight phases during the given day at the given location.