Sidereal Time

Science / Weather / Sidereal Time: The measure of time as defined by the diurnal motion of the vernal equinox. A sidereal day is equivalent to one complete rotation of the earth relative to the equinox, which is 23 hours, 56 minutes, and 4.091 seconds. A sidereal year is the interval required for the earth to make one absolute revolution around the sun, which is 365 days, 6 hours, 9 minutes, and 9.5 seconds. Compare with the solar day.

Other Words for Time

Time Noun Synonyms: period, interval, stretch, spell, patch

Sidereal Zodiac

Science / Astrology / Sidereal Zodiac: Based on the division of the circle of twelve constellations: Aries, Taurus, Gemini, Cancer, Leo, Virgo, Libra, Scorpio, Sagittarius, Capricorn, Aquarius and Pisces; the basis for sidereal astrology. MORE

Solar Time

Science / Tides and Currents / Solar Time: Time measured by the hour angle of the Sun. It is called apparent time when referred to the actual Sun and mean time when referred to the mean Sun. It is also classified as local, standard, or Greenwi MORE

Stability-Time Hypothesis

Science / Marine Biology / Stability-Time Hypothesis: Hypothesis that states that higher diversity occurs in habitats that are ancient and stable environmentally MORE