By Jose Chabas, Bernard R Goldstein

*A Survey of ecu Astronomical Tables within the past due heart Ages* is a primary try and classify and illustrate the varied astronomical tables compiled from in regards to the tenth century to the early sixteenth century within the Latin West. The compilation of astronomical tables used to be an immense and dynamic highbrow company. those tables reply to a large choice of astronomical difficulties and computational wishes, and comprise a lot of inventive ideas proposed by means of astronomers over the centuries. within the absence of algebraic notation and mathematical graphing thoughts, a desk was once usually the right way to transmit specified details to the reader. certainly, an astronomical desk isn't a only a checklist of information, yet a based strategy to current numerical info of astronomical curiosity. ..".the entire booklet that is a superb consultant for all those who find themselves attracted to the historical past of medieval eu astronomy and, specially, in medieval astronomical tables." *Julio Samso, college of Barcelona*

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29 b 30 Weekday Month Weekday 4 1 1 2 ... 11 12 1 3 7 5 2 4 the first entry in the sub-table on the left is to be read as 0,2,57,11 days or 2·602 + 57·60 + 11 (= 7200 + 3420 + 11 = 10631) days. If we divide 10631d by 30y we find a year length of 354;22 days. In the central sub-table it is easy to recognize the equivalence of 1 year, 5,54d 11m = 35411/30 days, for “m” in the heading indicates here a thirtieth, not a sixtieth, of a day. The Arabic names of the months in the Hijra calendar shown in the sub-table on the right reflect one of many medieval transcriptions of these month names.

Sachau 1879). The next issue to be considered is the procedure for converting dates from one calendar to another. The modern solution is to convert a date in one calendar into the corresponding Julian Day Number (where the day begins at noon), a simple day count, with no division into months or years, from an arbitrary epoch, and then to convert the Julian Day Number into the date in some other calendar. , each pair of calendars was treated separately. In the course of the Middle Ages the original astronomical rationale for including a section on chronology in sets of astronomical tables was largely forgotten, but tables for chronology persisted (in some cases for astrological purposes or for establishing a fixed chronology for Biblical events).

7;53 7;54 7; 5 7; 0 3;14 0;23 ... 4;46 ... 2;49 ... 7;55 6;45 2;52 2;47 0;16 0;14 ... 4;56 4;58 ... 2;51 2;52 ... 7;57 7;57 6;28 6;22 1;45 0; 0 ... 5;17 ... 3; 5 ... 7;48 5;23 1; 5 1; 1 0;57 0; 0 0; 1 0; 2 ... ... 5;21 5;21 5;21 ... ... 3;26 3;29 3;32 ... ... 7;28 7;25 7;21 4;32 4;24 4;17 0;42 0; 6 ... 5;20 ... 3;37 ... 7;10 3;54 40 chapter three Table 3B: Some historical examples of the equation of time Minimum in February maximum in May minimum in July Maximum in October Handy Tables 0;33,23h (Aqr 18°) 0;6,12h (Tau 30°) 0;16,21h (Leo 9°) 0;0,0h (Lib 30°–Sco 3°) al-Khwārizmī 0;0,0h (Aqr 22°) 0;23,28h 0;14,40h (Tau 30°–Gem 2°) (Leo 1°–7°) 0;34,28h (Sco 9°–10°) 0;0° (Aqr 18°–19°) 5;33° 3;4° (Tau 28°–Gem 5°) (Leo 1°–9°) 7;54° (Sco 8°–10°) al-Battānī, Toledan Tables, Parisian Alf.