Quadrivium Miscellany with Rithmomachia (Unknown) - Page 7

How much the sun rises in the middle of each sign at any hour in our climate In medieval astronomy, a "climate" refers to a specific band of geographical latitude which shares the same length of the longest day.. I shall briefly describe in the table presented below what I was able to grasp through practical experience with the astrolabe A portable medieval instrument used for timekeeping and calculating the positions of celestial bodies..

Hour	Jan	Feb	Mar	Aries	Apr	Taurus	May	Gemini	June	July	Aug	Sept
Days	Cap	Aqu	Pisc						Can	Leo	Vir	Lib
I	5	5	6	7	8	9	10	10	11	12	12	12
II	8	8	10	12	14	16	18	20	22	22	22	22
III	12	12	14	17	20	24	27	30	33	34	35	36
IIII	15	15	19	22	26	30	34	40	45	46	47	50
V	16	18	21	25	30	35	40	50	53	57	60	62
VI	17	19	22	27	31	36	41	52	58	62	64	65

Scorpio Sagittarius

With these values constructed, I most perfectly draw a quadrant term: quadrant; a quarter-circle instrument used to measure angles up to 90 degrees. of a circle on a flat tablet, having carefully fixed the center at point A. I divide its arc—that is, the curved line—internally into 3 parts; then I subdivide each of those into 6, and each of these into 5. In this way, the quadrant of the astrolabe is clearly divided into 90 parts original: "XC"; this creates the 90 degrees of a right angle (3 x 6 x 5 = 90).. This being done, from the center A itself where the lines meet...