The ancient papyrus, called Cairo 85637, is the oldest persevered historical document that includes data of ‘naked-eye’ observations of the variable star Algol, or beta (β) Persei. This calendar -dedicated to Algol, a manifestation of Horus, the sky god of Ancient Egyptian mythology contains forecasts of good or bad luck for every day of a year.
“The texts regarding the prognoses are connected to mythological and astronomical events,” says Master of Science Sebastian Porceddu.
Researchers at the University of Helsinki have conducted a statistical analysis of the mythological texts of this calendar. Their analysis revealed that periods of Algol (2.85 days) and Moon (29.6 days) strongly regulate the actions of the deities in this calendar.
“These eclipses last about ten hours and they can be easily observed with unaided eyes. Their period was discovered by the British amateur astronomer John Goodricke in the year 1783,” says docent Lauri Jetsu.
“We can explain why the period of Algol has increased by about 0.017 days,” added Lauri Jetsu. “The period increase during the past three millennia could have been caused by the observed mass transfer between the two members of this binary. In fact, this would be the first observation that confirms the period increase of Algol and it also gives an estimate of the mass transfer rate.”
The variability of Algol was first recorded in Modern times in 1670 by Geminiano Montanari. However, recent research confirms that the variable star and its period, were discovered much earlier than previously thought. It seems pretty clear that the Egyptians studied for 3 millennia such variability and indicated that the period of Algol was 2.85 days. For religious reasons, the ancient Egyptians recorded this period in one ancient papyrus, describing these repetitive changes. This also confirms the two “modern” astrophysical results reported by a group of researchers from Helsinki in 2013: The first direct observation of the expected increase in the period of Algol and an accurately estimated long-term mass transfer in this binary system.
“It seems that the first observation of a variable star was made 3000 years earlier than was previously thought,” says Lauri Jetsu. “However, I want to emphasise that our research has only been sent to a scientific journal about two weeks ago. This type of results can raise a lot of controversy before they are accepted.”
How ancient Egyptians had the ability to make incredibly difficult yet accurate astronomical observations is still a mystery for modern-day scholars. These accurate measurements, made thousands of years ago, provide useful constraints for modern astronomers around the globe.
“I would have serious doubts, if someone claimed, for example, that the Bible contains information about water in Mars. We claimed that Ancient Egyptian religious texts contain astrophysical information about Algol. It was no surprise to us that there were, and there still are, sceptics,” says docent Lauri Jetsu.
The above post is reprinted from materials provided by University of Helsinki.
Lauri Jetsu, Sebastian Porceddu. Shifting Milestones of Natural Sciences: The Ancient Egyptian Discovery of Algol’s Period Confirmed. PLOS ONE, 2015; 10 (12): e0144140 DOI: 1371/journal.pone.0144140
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