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
Six Months in Mexico the globe by ship and train. "Six Months in Mexico" at the Hathi Trust digital library Six Months in Mexico Six Months in Mexico is a book by Nellie Bly that she wrote after her travels through Mexico in about 1885. She took the initiative to work as a foreign correspondent at the age of 21. At that point she had been writing for the newspaper "The Dispatch", but had become dissatisfied with having to write for the women's pages. In the book she describes the lives and customs of the people of Mexico and the poverty of the common