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Although p is always positive when A1 corresponds to the epoch of this table, this is not always the case for an arbitrary time ti. Hence entries in the table from the radix (year 0) to year 2960 increase (here called 'direct'), but from year 3020 to year 3980 they decrease (here called 'retrograde'). The third column, headed motus in anno, gives the yearly increment or decrement (in seconds and thirds) for purposes of interpolation, and its entries can be recomputed by dividing the difference...

Tabula Domorum Clima

Chapter 27 is devoted to the casting of a horoscope for Ferrara and offers a worked example. We are told that the Sun is in Sgr 17 20 at 18 24h, counted from true noon. In Table 85, sub-table for the Sun in Sagittarius, we find 23 3h for 17 and 23 8h for 18 , in the column headed merid. By interpolation, the normed right ascension, expressed in hours and minutes, corresponding to the given position is 23 4,40h. We are then told to add it to the given time and to subtract 24h from the sum. The...

Introduction

One of the characteristics of an exact science is to explain theoretically the processes addressed by that discipline and to treat them precisely in a quantitative way. As an exact science, astronomy makes extensive use of numerical computations. In early astronomy, this is best exemplified by astronomical tables in the tradition of Ptolemy's Almagest that dates to the 2nd century, A.D. Throughout the Middle Ages, astronomers compiled a great variety of astronomical tables to help computers...

P3 pk pk d

Where d, the maximum of the third component of latitude for the inner planets (deviation), is 0 10 for Venus and -0 45 for Mercury. Had he followed them, he would have found for Venus P3 0 5,9 0 30,52 0 2,39 , and the final result would have been P 0 50,53 . Analogously, for Mercury he would have computed P3 -0 44 0 59,12 -0 44 , and in this case his final result would have been the same. In sum, all the entries in Bianchini's latitudes tables ultimately derive from Almagest XIII.5, but...

References

See Ratdolt, Tabule astronomice Alfontij Santritter, Tabule Astronomice Alfonsi Regis and Chabas and Goldstein, Alfonsine Tables of Toledo. Bianchini, Giovanni Tabulae astronomiae (Venice, 1495). - Tabule Joa nni Blanchini Bononiensis (Venice, 1526). Boffito, Giuseppe Le Tavole astronomiche di Giovanni Bianchini da un codice della Collezione Olschki, La Bibliofilia, 9 (1907-1908), 378-388 and 446-460. Chabas, Jos El Lunari de Bernat de Granollachs Alguns aspectes de la...

Symboll Of Elongation Of Planet

True positions of the planets Tables 27 (Saturn), 34 ( Jupiter), 41 (Mars), 48 (Venus), and 56 (Mercury) Na, ff. 24r-32v (Saturn Saturnus) ff. 33r-41v ( Jupiter) ff. 42r-59v (Mars) ff. 60r-77v (Venus) and ff. 78r-86v (Mercury) Nu, ff. 32r-40v (Saturn Incipiunt tabulae veri loci Saturni), ff. 41r-49v ( Jupiter) ff. 50r-67v (Mars) ff. 68r-85v (Venus) and ff. 86r-94v (Mercury) Rc, f. 20r-v (Saturn Saturnus only one folio is preserved, the rest was cut off) ff. 21r-25r ( Jupiter) ff. 25v-34r (Mars)...

Analysis Of The Tables

In the absence of an autograph copy, it is not possible to specify exactly the contents of the astronomical tables of Bianchini. Each manuscript copy and each edition we have consulted includes tables some of which may not be due to him. The problem is not unique to this case, for it applies to other sets of medieval tables that exist in multiple copies, such as the Toledan Tables or the Parisian Alfonsine Tables. As a living text, each copy was 'personal' for some astronomer and differs from...