المصادر
en.wikipedia.org/wiki/Speed_o...
en.wikipedia.org/wiki/Time
www.moonconnection.com/moon_ph...
en.wikipedia.org/wiki/Earth%2...
en.wikipedia.org/wiki/Orbit_o...
en.wikipedia.org/wiki/Galileo...
en.wikipedia.org/wiki/Galileo...
en.wikipedia.org/wiki/Sundial
en.wikipedia.org/wiki/Isaac_N...
www.grc.nasa.gov/www/k-12/air...
en.wikipedia.org/wiki/James_C...
www.physics.usyd.edu.au/teach_...
www.pas.rochester.edu/~pavone...
en.wikipedia.org/wiki/General...
physics.stackexchange.com/que...
www.rankred.com/biggest-unsol...
30 янв 2019