http://digfir-published.macmillanusa.com/astro_tutorial/astro_tutorial_ch03_solar_eclipses.html
Chapter
3. Solar Eclipses
51abd846b62f8bb75b000006
http://digfir-published.macmillanusa.com/astro_tutorial/astro_tutorial_ch03_solar_eclipses_dlap.xmlDLAP questions51abd846b62f8bb75b000006