Starry Night Times – January 2007 (explains why Sun appears to cross slow before early January) The analemma, elliptical orbit effect.
صفحة 186.  Starry Night Times – January 2007(explains why Sun appears to cross slow before early January) نسخة محفوظة 30 سبتمبر 2009 على موقع واي باك مشين.