General Caption: Emphemerides, Calculations, Al Khwarizmi (c.780--c.850):
The ephemeris is written in Medieval Latin and uses Roman numerals. The 12 zodiac constellations (or maybe the 12 zodiac signs) are listed in a lower right table column.
Image 1 itself is from Otto E. Neugebauer's (1899--1990) The Astronomical Tables of al-Khwarizmi, (1962), and so probably illustrates ephemeris adapted from the work of Al Khwarizmi (c.780--c.850).
Al Khwarizmi (c.780--c.850) was a Persian Medieval Islamic mathematician, Medieval Islamic astronomer, and Medieval Islamic geographer.
Among other things, he wrote the book Al Jabr (c.820) from whose title we derive the word algebra.
Al Khwarizmi's own name mutated into the modern word algorithm. He is the eponym of algorithm.
Algorism ultimately defeated
abacism.
You can do a very fast simple calculation
with an abacus, but there is
NO record of the
calculation, and so to check
the calculation you have to do all the
steps over again and probably make a new mistake.
And, of course, there is NO way to go beyond simple
calculations.
So algorism, with its written record
and ability to go on to more and more elaborate
calculations, had to win.
To give a comparison case:
algorism was like
a computer;
the abacus was like
a calculator.
And remember whenever you do anything more than a 1-step calculation
on a calculator, you always
get the wrong answer.