{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

history-page5 - Counting Basic Astronomical Events • What...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Mesoamerican Olmec = 1200 BC Maya = 300 BC Numeral system Unknown date of origin Vigesimal = base 20 But 18 · 20, 18 · 20 2 , etc. Reminiscent of ? Chinese counting-rods? Mesopotamian? Stacked vertically Had a zero Roman 753 BC Threw out the Etruscans in 509 BC Roman numerals I, V, and X borrowed from Etruscans L, C, D, and M come after 100 BC Additive Calinger: “Subtractive principle was used only sparingly in ancient and medieval times”
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Counting Basic Astronomical Events • What are the three most basic in order of most obvious? ◦ Day ◦ Lunar Month ◦ Year • Why don’t we think much about calendars and motions of moon, earth, and sun? ◦ Given to us ◦ Poor visibility of night sky ◦ Non-agricultural ◦ Other things to think about!...
View Full Document

{[ snackBarMessage ]}

Ask a homework question - tutors are online