Noon is again defined as exactly halfway during the daytime period but the intervals from sunrise to noon and from noon to sunset can be either more or less than 6 hours (around the equinoxes they are exactly 6 hours). The lengths of each day-time hour and night-time hour are necessarily unequal (they are only equal during the spring and autumn equinoxes or on the equator) and depend on the geographical latitude and the day in the year.Įqual hours: Here a complete diurnal or day and night-time period is divided into 24 equal hours. Noon is defined as the moment when the sun reaches its highest altitude and lies exactly halfway in the daylight period the moments of sunrise and sunset occur exactly 6 hours earlier and later. This was the most common system of counting hours in medieval and Renaissance Europe. The hours were counted from the moments of sunrise and sunset. Unequal, temporal, seasonal, Jewish or planetary hours: Here the periods of daylight and darkness are each divided into 12 equal intervals. There are two fundamental different types of hours, with their own further subdivisions: Many renaissance and early modern sundials carry a variety of hour scales, reflecting the wide diversity of customs for defining and counting the hours across the European continent. Epact: Scientific Instruments of Medieval and Renaissance Europe
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |