1. U. S. Naval Observatory (USNO) clock (2012) (
http://tycho.usno.navy.mil/cgi-bin/anim
).
2. Espenak, F. (2012). NASA Lunar Eclipse website (
http://eclipse.gsfc.nasa.gov/lunar.html
).
3. BAA Lunar Section/Aberystwyth University website for TLP repeat illumination predictions (2012) (
http://users.aber.ac.uk/atc/tlp/tlp.htm
).
4. Moon Zoo website (2012) (
http://www.moonzoo.org/
)
5. Moon Mappers website (2012) (
http://cosmoquest.org/mappers/moon/
).