And Moses commanded them, “At the end of every seven years, at the set time of the year of release, at the feast of booths, when all Israel comes to appear before the Lord your God…Deuteronomy 31:10-11
“And if you will obey my commandments which I command you this day, to love the Lord your God, and to serve him with all your heart and with all your soul, he will give the rain for your land in its season, the early rain and the later rain, that you may gather in your grain and your wine and your oil. Deuteronomy 11:13-14
“You shall keep the feast of booths seven days, when you make your ingathering from your threshing floor and your wine press; you shall rejoice in your feast, you and your son and your daughter, your manservant and your maidservant, the Levite, the sojourner, the fatherless and the widow who are within your towns. For seven days you shall keep the feast to the Lord your God at the place which the Lord will choose; because the Lord your God will bless you in all your produce and in all the work of your hands, so that you will be altogether joyful. Deuteronomy 16:13-15
(Those witnessing for the Lord will be blessed in their harvest.)
There are 1813 years between 31 AD and 1844. 1813 divided by (anti-type years) 33.898 = 53.4 (type days)
There are 53.4 days between the 10th of Nisan and Friday evening the 48th day (month of Sivan) at the feast of First Fruits. Please see charts under the Day of Atonement.