Apparent Positions of the Planets:
NASA Solar System Dynamics: Orbital charts of the current location of planets.
Solar Rotation:
SDO Images: Realtime imaging of the Sun from SDO spacecraft.
NOAA Spaceweather Forcasts: Watch for solar flare activity that may effect the Earth.
Lunar Imaging:
Google Moon: Chart the location of maria, craters, and landing sites.
Impact Earth: Calculate effects of a meteor impact.
NASA NEO Program: Search for near earth objects.
Search for Extraterrestrial Intelligence (SETI):
Exoplanets Database: Up-to-date list of all known exoplanets.
