Upload
nathaniel-young
View
216
Download
0
Tags:
Embed Size (px)
Citation preview
Announcements• For next time: read Chapter 2. Come to class Friday
with a question to pose to the class for discussion. Be prepared to lead the discussion.
• Let me know the book you want to do your 1st project on as soon as you decide. First-come-first-served with no duplication is allowed.
• Dark Sky Observing Night this Thursday. Forecast is iffy. I’ll know more by Wednesday. Activities start at 8:30pm so set-up begins at 7:30pm.
Chapter 1Astronomy Before History
Hopi horizon calendar: sunset in the San Francisco peaks near Flagstaff Arizona
The Mayan Calendar
They had three cycles in their calendar: 365 days, 360 days and 260 days. They were also big on the cycles of Venus (584 days).