Winter solstice instant of the solstice can be calculated, direct observation of the solstice by amateurs is impossible because the sun moves too slowly or appears to stand still (the meaning of "solstice"). However, by use of astronomical data tracking, the precise timing of its occurrence is now public knowledge. One cannot directly detect the precise instant of the solstice (by definition, one cannot observe that an object has stopped moving until one later observes that it has not moved further from the preceding spot, or that it has moved in the opposite direction). Further, to be precise to a single 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