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By Jose Chabas, Bernard R. Goldstein

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Extra info for The Astronomical Tables of Giovanni Bianchini (History of Science and Medicine Library)

Sample text

However, Regiomontanus has 4,58;4,18° for the Incarnation and 3,39;54,34° for 1400, whereas he should have 4,28;4,18° and 3,9;54,34°, respectively. 6 This is exactly the longitude of Ferrara given in Bianchini’s text (Introduction and Chapter 1), but differs from that assigned to Ferrara (33;30°) in the table for geographical coordinates, which is only included in ed. 1526 (see Table 87, below). The difference in longitude between Toledo and Ferrara is 21°, and corresponds to adjustments of –0;3,27° and +0;0,11° in the values for the mean motion of the Sun and the lunar node, respectively.

The entries in the second column, under the heading ‘June’, are given in days, hours, and minutes (from 3d 23;38h for year 0 to 13d 1;6h for year 2000). As explained in Chapter 7, the entries show the date and the time the Sun is at its apogee in a given year. The heading of the third column is ‘equation’ and entries are only given for some selected arguments, in hours, minutes, and seconds; they represent the amount to be added to the corresponding entry in the second column when the given year is one, two, or three years after a leap year.

1526, f. 16r: Tabula mensium non bisextilium and Tabula mensium bisextilium This table has two sub-tables, one for a common year and another for a leap year, both beginning in January: see Table 16. The layout of this table is the same as that of Table 12, but here the first column lists the names of the 12 months. As was the case in previous tables, Regiomontanus omitted the column for the argument of lunar latitude. Table 16: Monthly mean motion of the Moon for a common year (excerpt) Time Double elongation (°) Longitude Arg.

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