Jew's Babylonian calendar calculations are off. We can suspect this by their corrupt fruit. For example, most Jews use Babylonian names for the name of the month, and the days of the week. They also start their day at sundown, just like the Babylonians did, and the Muslims still do. All of this conflicts with the Bible.
Roman Catholic calculations, based on Jew's errors, are also off. Most Protestant denominations blindly follow the Roman Catholics
After careful study of the alternatives, I agree with Dr. Barry Awe's recommendations for God's likely Biblical calendar:
It is suggest that the fully correct definition for the start of the Biblical year is the earliest date that meets all of the following 6 criteria:
1. Day of Equilux (ie. 12 hr. day, 12 hour night) has occurred (always on March 17th).
2. Spring Equinox has occurred (ie. also called the Vernal Equinox or "first point of Aries". This occurs when the Sun is positioned directly above Earth's equator, which causes the Sun to rise directly East, and sets directly West; usually occurs on March 19, 20, or 21).
3. The Waxing New Moon crescent becomes visible just after sunset. The first visible sign of the new moon is the "young moon" or waxing crescent, which appears very low on the western horizon just after sunset, typically 18–30 hours after the official astronomical new moon.
4. The New Moon is in the constellation Aries.
5. The Sun is in the constellation Pisces.
6. At or shortly after sunset, the constellations Orion, Great Bear ( ie. Ursa Major), Arcturus (in Bootes), and Spica (in Virgo) are above the horizon & visible in Jerusalem, Israel (see Job 38:31-33).
Application of Rules to 2026
In 2026, all of these conditions are true for the start of the Biblical New Year on April 18, 2026 at sundown.
According to Stellarium, New Moon begins at 2026-4-17 1:25:20, as phase goes from 0.1 to 0.0
At 2026-4-18 3:14:36, Moon phase goes from 0 to 0.1
New Moon Duration= 22:34:40 + 3:14:36= 25:48:76= 1d:1h:49m:16s
Mid-point= 0.5d:0.5h:24.5 m:8 s= 0d:12h:54m:38s
Astronomical New Moon Centre Point= 2026-4-17 13:79:58= 2026-4-17 14:19:58
Thin crescent is first visible at 18 to 30 hours after this centre point.
First likely visibility of sliver of Moon at 2026-4-17 32:19:58= 2026-4-18 8:19:58, with 1% phase illumination.
Add 15 days for full Moon on Preparation Day= 2026-4-33 8:19:58= 2026-5-3 8:19:58
Passover begins at Sundown (ie. 7:22 pm in Jerusalem Israel), after Preparation Day= 2026-5-3 19:22:00 pm.
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