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
Technical school necessary to begin working in the chosen career field; additionally, the training is more time intensive, often including more than nine in-class hours per day. Military technical school is typically one to three months in duration, though some schools are as short as two weeks or as long as two years. Upon graduation, military technical school recruits are qualified only as apprentices and must work under supervision until they have completed a more extensive on-the-job training program. Many times the military training can be converted to standard university credits, leaving the graduating recruit with only a few general education requirement