The original Enoch-Antediluvian calendar operated on a perfect 360 day year with 12 perfect 30 day months (See Gen. 8:3-18). The Book of I Enoch tells us of a year comprising a 364 day count (I Enoch 82:6), which implies that the calendar portion in the Book of Enoch is likely corrupt and was penned much later, as one can not sync an unstable skewed 364 day year with a reoccurring and stable 360 day Preflood year.
The Postdiluvian years that we have today (2013 C.E.) (either lunar, solar, or whatever else) cannot currently fix back-to-back continual 360 day years, which is ultimately due to the stellar bodies being knocked off of their original circuits since the Great Flood and/or some time thereafter [See: Velikovsky, Worlds in Collision]. (However, there are modern ways of explaining the presence of a current 364 day year, as distinguished from a tropical 365.25 day year; See: http://en.wikipedia.org/wiki/Calendar_reform.)
There are other portions of I Enoch that suggest that it was written Post-flood; in fact, long after the Great Flood, up to some time around 250 BCE; and scholars (R.H. Charles, R. Lawrence) are, for the most part, unanimous upon this as the original date of its authorship. Yet we know this date is definitely not during the Antediluvian era when Enoch lived, so therefore the calendar proposed in I Enoch is NOT an original Preflood calendar (360 Prefl. y. vs. 364 Postfl. y.), and was added (and figured) by a later scribe, and hence in all likelihood, corrupt from the original Preflood calendar. Thus, the Preflood calendar (Gen. 1:14; 8:3-18) was different than the current Postflood calendars of today, so one should not use the Book of I Enoch to try and forcefully superimpose a Preflood calendar (let alone a corrupt "Preflood" calendar) onto a Postdiluvian world.
The traditional Hebrew calendar continues to use the Lunar Months as required by the Torah:
10 Also in the day of your gladness, and in your appointed seasons, and in your new
moons, you shall blow with the trumpets over your burnt-offerings, and over the sacrifices of your peace-offerings. And they shall be to you for a memorial before your Elohim: I am YHWH your Elohim.
And in your new moons, you shall present a burnt-offering unto YHWH: two young
bullocks, and one ram, seven he lambs of the first year without blemish.
The word for "Month" in Hebrew is CHODESH and the word for "New Moon" is ROSH CHODESH (literally, the head/beginning of the moon/month)
And lest anyone should argue that ROSH CHODESH refers to a new month, but not necissarily to a New Moon:
6 And even the shining moon wanes according to its time.
Though it is for ruling the seasons and an everlasting sign.
7 By it are the seasons and the times of the statute:
And shining, it vanishes in its circuit.
8 The new moon (Rosh Chodesh), according to its name renews itself;
How wonderful is it when it changes!
The beacon of the host wanes on high,
Leaving the firmament aglow from its shining.
All I can say is that there are some really goofy ideas presented here along with a few good replies. All you Hebrew "experts" are simply amazing!