Eratosthenes went further and computed the tilt of the Earth's axis to within a degree. This is the tilt which is the main cause of the annual climate cycle of spring, summer, autumn, winter. He also deduced the length of the year as 3651⁄4 days. He suggested that calendars should have a leap day every fourth year, an idea taken up two centuries later by Julius Caesar.= = = Tubule = = =
ɪ ɹ ʌ t ɑ s θ ə n iː z WORD_BOUNDARY w ɛ n t WORD_BOUNDARY f ɜː ð ə ɹ WORD_BOUNDARY æ n d WORD_BOUNDARY k ə m p j uː t ɪ d WORD_BOUNDARY ð ə WORD_BOUNDARY t ɪ l t WORD_BOUNDARY ʌ v ð ɪ WORD_BOUNDARY ɜː θ z WORD_BOUNDARY æ k s ɪ s WORD_BOUNDARY t ʊ WORD_BOUNDARY w ɪ ð ɪ n WORD_BOUNDARY ʌ WORD_BOUNDARY d ɪ ɡ ɹ iː WORD_BOUNDARY ð ɪ s WORD_BOUNDARY ɪ z WORD_BOUNDARY ð ə WORD_BOUNDARY t ɪ l t WORD_BOUNDARY w ɪ t̠ʃ WORD_BOUNDARY ɪ z WORD_BOUNDARY ð ə WORD_BOUNDARY m eɪ n WORD_BOUNDARY k ɔ z WORD_BOUNDARY ʌ v ð ɪ WORD_BOUNDARY æ n j uː ə l WORD_BOUNDARY k l aɪ m ə t WORD_BOUNDARY s aɪ k ə l WORD_BOUNDARY ʌ v WORD_BOUNDARY s p ɹ ɪ ŋ WORD_BOUNDARY s ʌ m ə ɹ ɹ WORD_BOUNDARY ɔ t ʌ m WORD_BOUNDARY w ɪ n t ə ɹ WORD_BOUNDARY h iː WORD_BOUNDARY ɔ l s oʊ WORD_BOUNDARY d ɪ d uː s t WORD_BOUNDARY ð ə WORD_BOUNDARY l ɛ ŋ θ WORD_BOUNDARY ʌ v ð ə WORD_BOUNDARY j ɪ ɹ WORD_BOUNDARY æ z WORD_BOUNDARY θ ɹ iː WORD_BOUNDARY θ aʊ z ə n d WORD_BOUNDARY s ɪ k s h ʌ n d ɹ ɪ d WORD_BOUNDARY f ɪ f t i WORD_BOUNDARY w ʌ n WORD_BOUNDARY f ɔ ɹ WORD_BOUNDARY d eɪ z WORD_BOUNDARY h iː WORD_BOUNDARY s ə d̠ʒ ɛ s t ɪ d WORD_BOUNDARY ð æ t WORD_BOUNDARY k æ l ə n d ə ɹ z WORD_BOUNDARY ʃ ʊ d ə v WORD_BOUNDARY ʌ WORD_BOUNDARY l iː p WORD_BOUNDARY d eɪ WORD_BOUNDARY ɛ v ɹ i WORD_BOUNDARY f ɔ ɹ θ WORD_BOUNDARY j ɪ ɹ WORD_BOUNDARY ʌ n WORD_BOUNDARY aɪ d iə WORD_BOUNDARY t eɪ k ə n WORD_BOUNDARY ʌ p WORD_BOUNDARY t uː WORD_BOUNDARY s ɛ n t̠ʃ ə ɹ ɹ i z WORD_BOUNDARY l eɪ t ə ɹ WORD_BOUNDARY b aɪ WORD_BOUNDARY d̠ʒ uː l ɪ ə s WORD_BOUNDARY s iː z ə ɹ WORD_BOUNDARY iː k w ə l z WORD_BOUNDARY iː k w ə l z WORD_BOUNDARY iː k w ə l z WORD_BOUNDARY t uː b j uː l WORD_BOUNDARY iː k w ə l z WORD_BOUNDARY iː k w ə l z WORD_BOUNDARY iː k w ə l z WORD_BOUNDARY