"calculates the appearance of the sky at any time between the years 1900 and 2100, and from any point on Earth."
Star Atlas (hosted)
Displays positions of the stars, sun, and planets.
A "Space Flight Simulator". A few simple controls allow moving around the planets and nearby stars.
Moon Tool (hosted)
Displays "the moon in its current phase along with detailed information on the Moon’s phase cycle".
"Display information about the moon", such as current phase."
"Shows the phases of the moon on a small calender."
"Fully integrated software package for positional astronomy".
"continually updating, real-time graphical representation" of the moon.
"continually updating graphical representation of daylight and nighttime regions of the Earth".
"For solar eclipse aficionados".
A "random solar system generator".