Ecliptic coordinate system Wikipedia The ecliptic coordinate system is a celestial coordinate system commonly used for representing the apparent positions and orbits of Solar System objects Because most planets except Mercury and many small Solar System bodies have orbits with slight inclinations to the ecliptic using it as the fundamental plane is convenient The systems origin can be the center of either the Sun or Earth Ephemerides definition of ephemerides by The Free Dictionary They discuss time before the 20th century solar time ephemerides variable earth time earth rotation and polar motion ephemeris time relativity and time dynamical and coordinate time scales clock developments microwave atomic clocks optical atomic standards the definition and role of a second international atomic time coordinated universal time time in the solar system time and Equinox Wikipedia An equinox is commonly regarded as the instant of time when the plane extended indefinitely in all directions of Earths equator passes through the center of the Sun This occurs twice each year around 20 March and 23 other words it is the moment at which the center of the visible Sun is directly above the equator The word is derived from the Latin aequinoctium from aequus Koordinoitu yleisaika – Wikipedia Koordinoitu yleisaika UTC on ensisijainen aikajärjestelmä jolla maailman aika määrätää pysyy noin sekunnin sisällä keskimääräisestä aurinkoajasta nollapituuspiirillä eikä sitä ole sidottu kesäin maissa termiä GMT Greenwich Mean Time käytetään usein UTCn synonyyminä Earths rotation Wikipedia Earths rotation is the rotation of Planet Earth around its own rotates eastward in prograde viewed from the north pole star Polaris Earth turns counterclockwise The North Pole also known as the Geographic North Pole or Terrestrial North Pole is the point in the Northern Hemisphere where Earths axis of rotation meets its surface
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ISBN: 1891389858
Release Date: 2012-09-17
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