If sept stands for 7, oct(8), nova(9) deca(10) then why is september the 9th month of year so on till december

Answer 1

originally the month prefixes corresponded with the order in which the months occoured until a couple Roman empoers decided to add a couple of completely self serving moths to the calendar
Julius Caesar added July and Augustus added August these two modifications pushed each prefixed month off by two hense
September=9th
October=10th
November=11th
December- 12th

Answer 2

In Latin, septi means "seven" and septem means "seventh"; September was also the seventh month of the Roman calendar until 153 BC.

And now September is the ninth month of the year in the Gregorian Calendar and one of four Gregorian months with 30 days.

And for a little more information about September. September begins in western tropical astrology with the sun in the sign of Virgo and ends in the sign of Libra. Astronomically speaking, the sun actually begins in the constellation of Leo and ends in the constellation of Virgo.

Answer 3

December was originally the 10th month on the Roman Calendar.

Answer 4

Earlier, there were, only 10 months. September (septa- seven) was seventh month. But, July (Julius) & August (Augustus)were added.

Answer 5

Sept and september are two different things

Answer 6

Hopefully the following web pages will further enlighten you:

http://www.crowl.org/Lawrence/time/months.html

Answer 7

WONDERFUL QUESTION!
Actually the months were named after Roman emperors,not after septa,octa,hecta,nova etcetra.
Eg.JULY-JULIUS CAESAR
AUGUST-AUGUSTUS