parallax$57788$ - translation to ελληνικό
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parallax$57788$ - translation to ελληνικό

APPARENT SHIFT OF POSITION OF A NEARBY STAR AGAINST THE BACKGROUND OF DISTANT OBJECTS DURING EARTH'S ORBITAL PERIOD
Stellar Parallax; Parallax error; Stelaar parralax; Parallax method; Annual parallax; Secular parallax; Stellar parallax method
  • The split lens of the Bamberg Heliometer (late 19th century)
  • The Dollond heliometer of the late 1700s
  • Diagram of a heliometer from the 1911 ''Encyclopædia Britannica'', which would be a view looking towards the split lens of a heliometer
  • newspaper=ESA/Hubble Images}}</ref>
  • Bessel's heliometer
  • Parallax of Proxima Centauri as observed from New Horizons and Earth.
  • frameless
  • 500x500px
  • AU]] and 1 parsec are not to scale, 1 parsec = ~206265 AU)

parallax      
n. παράλλαξη

Ορισμός

PARSEC
Extensible language with PL/I-like syntax, derived from PROTEUS. "PARSEC User's Manual", Bolt Beranek & Newman (Dec 1972).

Βικιπαίδεια

Stellar parallax

Stellar parallax is the apparent shift of position (parallax) of any nearby star (or other object) against the background of distant stars. By extension, it is a method for determining the distance to the star through trigonometry, the stellar parallax method. Created by the different orbital positions of Earth, the extremely small observed shift is largest at time intervals of about six months, when Earth arrives at opposite sides of the Sun in its orbit, giving a baseline distance of about two astronomical units between observations. The parallax itself is considered to be half of this maximum, about equivalent to the observational shift that would occur due to the different positions of Earth and the Sun, a baseline of one astronomical unit (AU).

Stellar parallax is so difficult to detect that its existence was the subject of much debate in astronomy for hundreds of years. Thomas Henderson, Friedrich Georg Wilhelm von Struve, and Friedrich Bessel made first successful parallax measurements in 1832-1838, for the stars alpha Centauri, Vega, and 61 Cygni.