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http://earth.snu.ac.kr/~cypark/HTML/ASTROLAB/report2_04.html

http://www.kangwon.ac.kr/~sericc/sci_lab/earth/star_light/star_light.html

http://science.kongju.ac.kr/ms/earth/middle3/txt/ea3012.html

http://net.kitel.co.kr/~meeinn/±³¼öÀÚ·á/Áö±¸¿Í%20¿ìÁÖ%2017Â÷½Ã.htm

http://www.cyberschool.co.kr/sn/ear/ear7/ear711.htm