|Illumination of the Earth by the Sun|
at the March equinox, as seen from the Sun.
March 1st or March 20th - this year some will argue, with good reason, that spring still isn't here!
If you have an interest in the astronomical you will find the U.S. Naval Observatory (USNO) web site a wealth of information. The USNO serves as the official standard of time for the entire United States. You can determine sunrise or sunset for any location in the country or find out when the phases of the moon will occur at any point in the future, or get the dates and times of the equinoxes and solstices. The Sky This Week describes what planets can be viewed and what other astronomical phenomena can be observed.
Trenberth, Kevin E., 1983: What Are the Seasons? Bulletin of the American Meteorological Society, Vol. 64, No. 11, pp. 1276-1282.