Retired Engineer Offers $20,000 to Disprove Biblical Chronology Model

Don Roth challenges 'Bible believing Christians' and skeptics to test his research aligning Biblical events with modern timekeeping.

Mar. 31, 2026 at 9:39pm

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A bold, highly structured abstract painting featuring sweeping geometric arcs, concentric circles, and precise botanical spirals in earthy tones, conceptually representing the complex scientific forces and concepts underlying a researcher's efforts to align Biblical chronology with modern timekeeping.A visually striking abstract diagram representing the intricate connections between Biblical chronology and modern timekeeping systems, as explored in one man's ambitious research project.Hustisford Today

Don Roth, the 90-year-old creator of the Biblical Calendar Proof website, is offering a $20,000 reward to anyone who can demonstrate mathematical or astronomical errors in his research, which attempts to show that the Biblical weekly cycle and chronology of major events like the flood and crucifixion align with modern timekeeping systems. Roth, a former engineer, has spent over 15 years studying scriptural time references and astronomical patterns to build his calendar model, which he believes stands on objective evidence rather than tradition or titles.

Why it matters

Roth's work challenges long-held beliefs about the loss of the original Biblical weekly cycle and the ability to chronologically map key scriptural events. If his model is proven accurate, it could have significant implications for how Christians and others interpret Biblical timelines and the relationship between scripture and modern science.

The details

Roth's calendar research aims to demonstrate that the creation week described in Genesis aligns with our modern seven-day weekly cycle, and that major Biblical events like the flood and the crucifixion can be dated using scriptural chronological markers. His main argument is that the seventh-day Sabbath established at creation still corresponds to what is known today as Saturday. Roth is inviting both religious and non-religious researchers to submit verifiable scientific, historical, or astronomical evidence that could disprove the accuracy of his calendar model.

  • Roth began his research journey in 2007 after disagreements over how to calculate Biblical holy days.
  • In 2008, widespread Midwest flooding prompted Roth to take a closer look at the Biblical account of Noah's flood.
  • Roth spent more than three years building and documenting his calendar research model.

The players

Don Roth

The 90-year-old creator of the Biblical Calendar Proof website, who is a retired engineer and has spent over 15 years studying scriptural time references and astronomical patterns to build his calendar model.

Biblical Calendar Proof

An independent research initiative studying Biblical chronology using mathematical and astronomical analysis to examine historical timekeeping described in scripture.

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What they’re saying

“Prove my Biblical calendar calculations are mathematically wrong and earn a $20,000 reward.”

— Don Roth, Creator, Biblical Calendar Proof

What’s next

Roth is encouraging both religious and non-religious researchers to submit verifiable scientific, historical, or astronomical evidence that could disprove the accuracy of his calendar model in order to claim the $20,000 reward.

The takeaway

Roth's research challenges long-held beliefs about the loss of the original Biblical weekly cycle and the ability to chronologically map key scriptural events. If his model is proven accurate, it could have significant implications for how Christians and others interpret Biblical timelines and the relationship between scripture and modern science.