Cymedrolwr: Gwen
Hazel a ddywedodd:"Yn ystod y cyfnod o gwmpas 18,000 cc......" Ydy "cc" yr un â "ce" yn Saesneg? Efallai "cyfnod Cristnogol"?
n the United States, the usage of the BCE/CE notation in textbooks is growing.[51] Some publications have moved over to using it exclusively. For example, the 2007 World Almanac was the first edition to switch over to the BCE/CE usage, ending a 138-year usage of the traditional BC/AD dating system.
Defnyddwyr sy’n pori’r seiat hon: Dim defnyddwyr cofrestredig a 28 gwestai