The Following is from this site. A very good explanation of an accurate count: http://www.exposingtheenemy.com/what-we-believe/does-god-have-a-calendar/count-to-pentecost-proves-lunar-sabbaths
Pentecost is a memorial for the giving of the law at Sinai just as it is also a memorial for the giving of the holy spirit. The only way for the count to Pentecost to coincide with the giving of the law at Sinai is through the lunar Sabbath. The traditional Saturday Sabbath will not work, and therefore, this is further proof for the lunar Sabbath.
And ye shall count unto you from the morrow after the sabbath, from the day that ye brought the sheaf of the wave offering; seven sabbaths shall be complete: Even unto the morrow after the seventh sabbath shall ye number fifty days; Lev. 23:15-16
This is the verse that tells us how to count to Pentecost. The majority of the Christian world misinterprets this verse to say that Pentecost is 50 days after the wave sheaf. The proper count is to count 50 days from the day after the 7th sabbath complete. This makes Pentecost to occur at the end of the 4th month instead of the beginning of the 3rd month. There are many ways to prove this. I will make another page to prove this, but this page will show how only a lunar Sabbath can make the count arrive at the right day.
In the third month, when the children of Israel were gone forth out of the land of Egypt, the same day came they into the wilderness of Sinai. Ex. 19:1
The Israelites left Egypt the night of the 15th of the 1st month. Therefore they arrived at Sinai on the night of the 15th of the 3rd month. This immediately rejects the traditional count to Pentecost. The traditional count places Pentecost before the Israelites had even arrived at Sinai. Seven Sabbaths complete from the waving of the sheaf brings you to the 8th day of the 3rd month. So the 50 day count starts on the 9th day of the 3rd month. So because the Israelites arrived at Sinai on the 15th, they are at this point 7 days into the count to 50 to Pentecost.
And it came to pass on the third day in the morning, that there were thunders and lightnings, and a thick cloud upon the mount, and the voice of the trumpet exceeding loud; so that all the people that was in the camp trembled. And Moses brought forth the people out of the camp to meet with God; and they stood at the nether part of the mount.Ex. 19:16-17
So the Israelites were consecrated for 2 days and were ready by the 3rd day. This 3rd day is when God appeared in a thick cloud on Sinai. So we are now 10 days into the 50 day count to Pentecost.
And Moses went into the midst of the cloud, and gat him up into the mount: and Moses was in the mount forty days and forty nights. Ex. 24:18
Then Moses went up on the mountain and was there for 40 days and nights. This brings our total from 10 days to the 50 days. So what happened next?
And he gave unto Moses, when he had made an end of communing with him upon mount Sinai, two tables of testimony, tables of stone, written with the finger of God. Ex. 31:18
So therefore, the law was given to Moses at the end of this 50 day count.
Please note, that the ONLY way for Pentecost to line up with the day that God gave the law to Moses is to use the lunar Sabbath. If you use the traditional Saturday Sabbath, you will not calculate the right day. This by itself is extraordinary PROOF that the lunar Sabbath is the true way in which to reckon God’s holy day of rest.