The Holy Days From the LCG Site
This calendar uses Jewish reasoning with Jewish
Postponements
The new moon is not used in the calculation.  
The Jews do not use the invisible conjunction as the new 
moon, but a 3% visible crescent. 
That would then make a full moon a bit lopsided as well, if the full  moon is
1/2 of a month away from the new moon (14.3/4 days)
Secular, everyday calendars, are more accurate than this.

* Passover   Feast of
  Unleavened Bread
  Day of
  Pentecost
  Feast of Trumpets
  Old Testament meaning
A lamb was sacrificed and its blood placed around the doors of Israelite houses in Egypt, which God "passed over" when slaying the Egyptian firstborn.
(Leviticus 23:5)
A seven-day festival during which leavening (such as yeast, which causes bread to rise when baking) is put out of dwellings and is not eaten.
(Leviticus 23:6-8)

Lev 23:9-14 Feast of Firstfruits left out intentionally

A day celebrating the gathering in of the first and smaller of the two annual harvests; observed 50 days from a fixed point in the previous Feast.
(Leviticus 23:15-22)
Called Rosh Hashana by the Jews; a day of rejoicing marked by the blowing of trumpets.
(Leviticus 23:23-25)
  New Testament meaning
Pictures Jesus Christ's shedding His blood for the sins of mankind. Pictures the Christian's duty to "put out sin" from a life yielded to Jesus Christ. Pictures the Christian's receiving God's Holy Spirit. Pictures a time of war and plagues, concluding with Jesus Christ's Second Coming.
2005 Apr 23
Apr 24 - 30 Jun 12 Oct 4
2006 Apr 12
Apr 13 - 19 Jun 4 Sep 23
2007 Apr 2
Apr 3 - 9 May 27 Sep 13
2008 Apr 19
Apr 20 - 26 Jun 8 Sep 30
2009 Apr 8
Apr 9 - 15 May 31 Sep 19
2010 Mar 29
Mar 30 - Apr 5 May 23 Sep 9

Understand the Author feel this calculation is in error
(continuation)

  Day of
  Atonement
  Feast of
  Tabernacles
  Last Great Day
  Old Testament meaning
A day of fasting and repentance, known to the Jews as Yom Kippur
(Leviticus 23:26-32)
A seven-day celebration of the great fall harvest, observed by living in temporary dwellings for the duration of the Feast.   (Leviticus 23:33-43) Adjacent to the Feast of Tabernacles, this eighth day is considered a separate Feast.
(Leviticus 23:36, 39)
  New Testament meaning
Pictures the binding of Satan at the beginning of the Millennium and the world becoming at one with God. Pictures the Millennium, when the earth will be ruled by Jesus Christ and His saints. Pictures the coming "Great White Throne Judgment" at which all of humanity not previously called will have the chance to hear the True Gospel and accept salvation.
2005 Oct 13
Oct 18 - 24 Oct 25
2006 Oct 2
Oct 7 - 13 Oct 14
2007 Sep 22
Sep 27 - Oct 3 Oct 4
2008 Oct 9
Oct 14 - 20 Oct 21
2009 Sep 28
Oct 3 - 9 Oct 10
2010 Sep 18
Sep 23 - 29 Sep 30
* Observed the previous evening after sunset

 Understand the Author feel this calculation is in error