Maya Calendar
During his last sabbatical, professor M. A. Ya made a surprising discovery about the old Maya calendar. From an old knotted message, professor discovered that the Maya civilization used a 365 day long year, called Haab, which had 19 months. Each of the first 18 months was 20 days long, and the names of the months were pop, no, zip, zotz, tzec, xul, yoxkin, mol, chen, yax, zac, ceh, mac, kankin, muan, pax, koyab, cumhu. Instead of having names, the days of the months were denoted by numbers starting from 0 to 19. The last month of Haab was called uayet and had 5 days denoted by numbers 0, 1, 2, 3, 4. The Maya believed that this month was unlucky, the court of justice was not in session, the trade stopped, people did not even sweep the floor.
標簽:
A.
M.
sabbatical
surprising
上傳時間:
2014-01-05
上傳用戶:libenshu01
//實驗板的AVR程序,驅動1602LCM(可顯示2行,每行16個字符)模塊顯示實驗練習。
//說明:RS高顯示/低指令輸入 RW高讀/低寫 EN高讀數據/下降沿寫數據
//具體電路可參照使用指南里的說明。每個字符為5×7或5×8的點陣,共16×2個字符。
//使用器件:ATMEGA8535,可更換。 使用默認的片內RC振蕩器,1MHz。
//接線定義:PD4,5,6 為RS,R/W,EA。數據位為PC口。
//使用的開關:SW2-1,2,3.SW1-1,2,3,4,5,6,7,8.SW2-5為背光開關。 SW3-8為系統復位端。
標簽:
AVR
實驗板
程序
上傳時間:
2014-12-01
上傳用戶:cmc_68289287