Autumnal Equinox (September 30, 2000)
Winter Solstice (December 20, 2000)
Vernal Equinox (March 27, 2001)
Summer Solstice (June 20, 2001)

Vernal Equinox (March 27, 2001)

Vernal Equinox (March 27, 2001)


How does the length of day and night change over a year? These videos provide some evidence to answer that question. A webcam at the Lawrence Hall of Science in Berkeley, California, takes a picture of San Francisco Bay every minute. The pictures are put together to show a time-lapse view of the bay's weather for a day. Each movie represents a day near the beginning of each season.



San Francisco is in the Pacific Standard Time Zone at 37°37' North 122°23' West.