http://digfir-published.macmillanusa.com/astro_tutorial/astro_tutorial_ch17_stellar_parallax.html
Chapter
17. Stellar Parallax
51d24078b62f8b1f15000008
http://digfir-published.macmillanusa.com/astro_tutorial/astro_tutorial_ch17_stellar_parallax_dlap.xmlDLAP questions51d24078b62f8b1f15000008