http://abyss.uoregon.edu/~js/ast121/lectures/lec02.html Sejarah Astronomi University of Oregon: História da Astronomia [em inglês] http://abyss.uoregon.edu/~js/ast121/lectures/lec02.html http://abyss.uoregon.edu/~js/ast121/lectures/lec02.html http://abyss.uoregon.edu/~js/ast121/lectures/lec02.html History of Astronomy http://abyss.uoregon.edu/~js/ast121/lectures/lec02.html http://abyss.uoregon.edu/~js/ast121/lectures/lec02.html http://abyss.uoregon.edu/~js/ast121/lectures/lec02.html Universidad de Oregón: Historia de la Astronomía History of Astronomy abyss.uoregon.edu http://abyss.uoregon.edu/~js/ast121/lectures/lec02.html History of Astronomy