Winter solstice one must be able to observe a change in azimuth or elevation less than or equal to about 1/60 of the angular diameter of the sun. Observing that it occurred within a two-day period is easier, requiring an observation precision of only about 1/16 of the angular diameter of the sun. Thus, many observations are of the day of the solstice rather than the instant. This is often done by observing the sunrise and sunset or using an astronomically aligned instrument that allows a ray of light to be cast on a certain point around that time. Length of day
Labours of the Months unusually large, allowing all the typical elements to be used in many months. It combines astrological and calendar information at the top, with a combination of the agricultural life of the peasant, the life of the elite courtiers, and illustrations of the Duke's many castles in the background of several scenes. A typical simple scheme was: - but there were many variations, especially in major wine-growing areas, where more wine related scenes were included. Italian cycles often advance the agricultural scenes a month earlier than ones from the Low countries or England. The impact of the onset of the Little