Astronomical Applications (U. S. Naval Observatory)
Sunrise, sunset, moonrise, moonset, and twilight; phases of the moon; eclipses; seasons; celestial information; and more.

Atomic Clock
Offical U.S. Time.

Calculation of the Ecclesiastical Calendar
Calculate the date of Easter and movable feasts in the Western (Catholic, Anglican, Protestant) and Eastern (Orthodox) traditions, plus links to other calendar pages.

Calendar Zone: Perpetual Calendars
Calendars from 2001-2100.

Make a Tide Prediction

Rosetta Calendar
Allows you to convert dates among various calendar systems: Jewish, Gregorian, and Hebrew.

Skywatcher's Diary
From the Abrams Planetarium, Department of Physics and Astronomy, Michigan State University.

Standard Time Zones of the World (Map)

Today in History Sites (University of North Texas)

Virtual Reality Moon Phase Pictures
Provides current phase of the moon or calculation of the phase of the moon on any date between 1800 and 2199.

What Time Is It?
Accurate time displays from the U.S. Naval Observatory. Gives time in Universal Time and standard time zones.

World Clock
Current local times around the world.