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
Dump months delineated as the winter dump months. In the past, it was usually considered to include all of August and September, and in some years still may. But, in years with many major summer movies, some may open on the first or second weekend of August to avoid competing with other such movies, such as "Guardians of the Galaxy", the first-ever August release by Marvel Studios, which took in $94 million on the first weekend of that month in 2014. It was the most successful August opening weekend, and it became one of the year's top-grossing films. By the end of