In the decades that followed, mayors of cities across the country began issuing yearly proclamations recognizing Negro History Week. By the late 1960s, thanks in part to the Civil Rights Movement and a growing awareness of black identity, Negro History Week had evolved into Black History Month on many college campuses. President Gerald R. Ford officially recognized Black History Month in 1976, calling upon the public to “seize the opportunity to honor the too-often neglected accomplishments of black Americans in every area of endeavor throughout our history.”
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Although there were only 365 days in the Haab year, the Mayas were aware that a year is slightly longer than 365 days, and in fact, many of the month-names are associated with the seasons; Yaxkin, for example, means "new or strong sun" and, at the beginning of the Long Count, 1 Yaxkin was the day after the winter solstice, when the sun starts to shine for a longer period of time and higher in the sky. When the Long Count was put into motion, it was started at , and 0 Yaxkin corresponded with Midwinter Day, as it did at back in 3114 . The available evidence indicates that the Mayas estimated that a 365-day year precessed through all the seasons twice in or 1,101,600 days.