If you really think first fruits is on day 26 Aviv. Then it just shows your complete lack of knowledge on the subject and combined with your pride shows why we are at the impasse we are at. This is such an easy one that:
I AM HOPING THAT SOMEONE ELSE HERE WILL CHIME IN AND CONFIRM TO YOU THAT THE DAY OF FIRST FRUITS IS DAY 16 AVIV.
That way you will begin to see that you are wrong about many things you believe about God's Calendar, as it is clear this is an issue of human nature and just not wanting to back down from a debate:
Leviticus 23:4-16
4 ‘These are the LORD’S appointed festivals, the sacred assemblies you are to proclaim at their appointed times: 5 The LORD’S Passover begins at twilight on the fourteenth day of the first month. 6 On the
fifteenth day of that month the LORD’S Festival of Unleavened Bread begins; for seven days you must eat bread made without yeast. 7 the first day
[Day 15] hold a sacred assembly and do no regular work. 8 For seven days present a food offering to the LORD. And on the seventh day
[Day 21] hold a sacred assembly, and do no regular work.’ 9 The LORD said to Moses, 10 “Speak to the Israelite's and say to them: ‘When you enter the land I am going to give you, and you reap its harvest, bring to the priest a sheaf of the first grain your harvest
[The first grain of the barley harvest]. 11 He is to wave the sheaf before the LORD so it will be accepted on your behalf; the priest is to wave it on the day after the Sabbath
[Day 16]. 12 On the day you wave the sheaf, you must sacrifice as a burnt offering to the LORD a lamb a year old without defect, 13 together with its grain offering of two-tenths of an ephah of the finest flour
[Made from the new grain of the barley harvest] mixed with olive oil, a food offering presented to the LORD, a pleasing aroma, and its drink offering of a quarter of a hin of wine. 14 You must not eat any bread, or roasted new grain, until the very day you bring this offering to your God
[Day 16]. This is to be a lasting ordinance for the generations to come, wherever you live. 15 ‘From the day after the Sabbath
[Day 16], the day you brought the sheaf of the wave offering, count off seven full weeks. 16 Count off fifty days up to the day after the seventh Sabbath, and then present an offering of new grain to the LORD.
[The first grain of the wheat harvest]
So here it shows God is naming day 15 of the first month as a Sabbath and day 16 was called the day of First Fruits,
when a sheaf of the new barley harvest was waved before the LORD and an offering of fine barley flour was burnt on
the altar of incense in the temple. Day 16 is the day Jesus resurrected as the first fruits of the harvest of souls from the World in fulfilment of the feast, that had been practices for over 1000 years. Most Jews failed to see Jesus was the fulfilment of Passover and of First Fruits but a minority did and they were His followers. Today is no different and most people fail to see that Jesus fulfilled these feast but a minority do. Somethings never change.