Science / Tides and Currents / Tropical Year: The average period of the revolution of the Earth around the Sun with respect to the vernal equinox. Its length is approximately 3 65.242,2 days. The tropical year determines the cycle of changes in the seasons, and is the unit to which the calendar year is adjusted through the occasional introduction of the extra day on leap years.
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Science / Weather / Tropical Air Mass: An air mass that forms in the tropics or subtropics over the low latitudes. Maritime tropical air is produced over oceans and is warm and humid, while continental tropical air is formed over arid regi MORE
Science / Marine Biology / Tropical: Being within the latitudinal zone bounded by the two tropics (23º 27' north and south latitude) MORE