I am a member of the Amateur Astronomers Association of Pittsburgh (AAAP) , and the Carnegie Mellon University Astronomy Club .

The Clear Sky Clock , for Pittsburgh, PA and Madison, WI

Beijing Amateur Astronomy Sodality (Chinese)
Silk Road Astronomy (Chinese)
Bootes forum (Chinese)
Gu Yu's Astrophotos

Sky & Telescope
SkyMap
The STScI Digitized Sky Survey
SkyView: NASA multi-wavelength sky survey.
Planetarium Software
NASA's Astronomical Data Center

TIGER Mapping Service
Microsoft Terra server
NIST Time
NIST clock

International Dark-Sky Association

Astronomy Picture of the Day (APOD) Archive
Earth Science Picture of the Day (EPOD)
James Young et al., Table Mountain Obs.
Arizona Sky Pages by Tom Polakis
Polar Image by Pekka Parviainen
Pages of Mats Mattsson.