แหล่งอ้างอิง
http://wapedia.mobi/th/%E0%B8%94%E0%B8%B2%E0%B8%A3%E0%B8%B2%E0%B8%A8%E0%B8%B2%E0%B8%AA%E0%B8%95%E0%B8%A3%E0%B9%8C
http://www.thaigoodview.com/library/studentshow/st2545/5-5/no31/galileo.html
http://www.thaigoodview.com/library/studentshow/st2545/4-5/no31-39/darasart.html
http://www.thaigoodview.com/library/studentshow/st2545/4-5/no31-39/first.html
http://www.space.mict.go.th/astronomer.php?name=galileo
http://www.space.mict.go.th/astronomer.php?name=kepler
http://www.thaigoodview.com/library/studentshow/st2545/4-5/no31-39/china.html
http://www.thaigoodview.com/library/studentshow/st2545/4-5/no31-39/meso.html
http://www.thaigoodview.com/library/studentshow/st2545/4-5/no31-39/greek.html
http://www.astroschool.in.th/public/teacher/encyclodetail_ans_inc.php?id=169
http://www.smartdcamp.com/math.htm
http://social.eduzones.com/hunny/3810
http://std.kku.ac.th/4730202980/astro/g2/TUI/About/55.html
http://www.thaigoodview.com/library/studentshow/st2545/4-5/no31-39/egypt.html
http://hilight.kapook.com/view/19498
http://www.thaigoodview.com/library/teachershow/phayao/oraphin_s/darasat/section2_p02.html
http://pirun.ku.ac.th/~b4813343/mercury.htm
http://www.thaigoodview.com/library/teachershow/phayao/oraphin_s/darasat/section2_p04.html
http://iam.hunsa.com/moshi6226/article/4378
http://www.thaigoodview.com/library/teachershow/phitsanulok/suwicha_p/mars.html
http://www.thaigoodview.com/library/teachershow/phitsanulok/suwicha_p/jupiter.html
http://www.thaigoodview.com/library/teachershow/phayao/oraphin_s/darasat/section2_p08.html