An easy-to-understand scientific background on the concept of a leap year. Has illustrations and links to information on related astronomical events such as leap day, the calendar, seasons, vernal equinox, tropical year, century, and Gregorian, Iranian, and Julian calendrical systems. (Librarian's Internet Index). (Copyright 2006 by Librarians' Internet Index)
Presents a brief description of the relationship between selected holidays and the vernal equinox (Easter), summer solstice (summer weddings), autumnal equinox (Thanksgiving), and winter solstice (Christmas).. (Copyright 2006 by Librarians' Internet Index)
