Reference Sites

American Association of Variable Star Observers

• https://www.aavso.org

Astronomy Picture of the Day (APOD)

• https://apod.nasa.gov/apod/

Richard Dibon-Smith - The Constellations

• http://www.dibonsmith.com/

Richard Dibon-Smith - The Flamsteed Collection

• http://www.dibonsmith.com/flamsteed.pdf

European Space Agency (ESA)

• http://www.esa.int/ESA

ESA Hipparcos Catalog

• https://www.cosmos.esa.int/web/hipparcos/catalogues

NASA

• https://www.nasa.gov

NASA Space Science Data Center

• https://nssdc.gsfc.nasa.gov/

National Optical Astronomy Observatory

• http://ast.noao.edu/

Peoria Astronomical Society - Constellation Pages

• http://www.astronomical.org/constellationsCopy/constellation_index.php

SEDS

• http://spider.seds.org

SEDS Constellations

• http://maps.seds.org/Const/constS.html

SEDS Messier Catalog

• http://www.messier.seds.org/

SIMBAD Astronomical Database

• http://simbad.cfa.harvard.edu/simbad/

SolStation.com

• http://www.solstation.com

Space Telescope Science Institute (STScI)

• http://www.stsci.edu/

United States Naval Observatory (USNO)

• https://www.usno.navy.mil/USNO

University of Illinois - Dept of Astronomy - Stars and Constellations Catalog

• http://stars.astro.illinois.edu/sow/sowlist.html

University of Leicester - Dept of Physics and Astronomy

• https://www2.le.ac.uk/departments/physics/research/xroa