Da [url=http://archive.geogebra.org/en/upload/index.php?&direction=0&order=&directory=Greek/Perissinaki%20Irini/Astronomy]Irini Perissinaki[/url][br][url]http://users.ira.sch.gr/iriniper/astronomy/[/url][br][url]http://splashragazzi.altervista.org/astronomia-dalla-grecia-le-fasi-lunari/[/url]

Tradotto dal lavoro di [url=http://archive.geogebra.org/en/upload/index.php?&direction=0&order=&directory=Greek/Perissinaki%20Irini/Astronomy]Irini Perissinaki[/url], 9 novembre 2009 (30 gennaio 2015)