![]() For naked-eye observation, the shift of the constellations Īt present, the rate of axial precession corresponds to a period of 25,772 years, so sidereal year is longer than tropical year by 1,224.5 seconds (20 min 24.5 s, ~365.24219*86400/25772).īefore the discovery of the precession of the equinoxes by Hipparchus in the Hellenistic period, the difference between The sidereal year is 20 min 24.5 s longer than the mean tropical year at J2000.0 (365.242 190 402 ephemeris days). The sidereal year differs from the solar year, "the period of time required for the ecliptic longitude of the Sun to increase 360 degrees", due to the precession of the equinoxes. Hence, for Earth, it is also the time taken for the Sun to return to the same position relative to Earth with respect to the fixed stars after apparently travelling once around the ecliptic. əl/, US also / s ɪ-/ from Latin sidus 'asterism, star'), also called a sidereal orbital period, is the time that Earth or another planetary body takes to orbit the Sun once with respect to the fixed stars. ![]() Time taken by the Earth to orbit the Sun once with respect to the fixed starsĪ sidereal year ( / s aɪ ˈ d ɪər i.
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