| Preeminent(preeminente, 
    sobresaliente) 
    among megalithic monuments in the British Isles, it is similar to an older 
    and larger monument at Avebury.
 
 The great prehistoric structure is enclosed(encerrado) 
    within(dentro de) 
    a circular ditch(zanja, 
    foso) 
    300 ft (91 m) in diameter, with a bank(loma, 
    terraplén) on the inner side, and is approached(alcanzado) 
    by a broad roadway(calzada) 
    called the Avenue. Within the circular trench(trinchera, 
    zanja) 
    the stones are arranged(ordenadas) 
    in four series: The outermost(más 
    exterior) 
    is a circle of sandstones(piedras 
    de arenisca) 
    about 13.5 ft (4.1 m) high connected by lintels(dinteles); 
    the second is a circle of bluestone menhirs; the third is horseshoe 
    shaped(forma de 
    herradura); the innermost(mas 
    interior), ovoid. Within the ovoid lies the Altar Stone.
 
 The Heelstone(piedra 
    de acero) 
    is a great upright(posición 
    vertical) 
    stone in the Avenue, northeast of the circle. It was at one time widely 
    believed(creencia 
    muy extendida) 
    that Stonehenge was a druid temple, but this is contradicted by the fact 
    that the druids probably did not arrive in Britain until c.250 BC In 1963 
    the American astronomer Gerald Hawkins theorized that Stonehenge was used as 
    a huge(enorme) 
    astronomical instrument that could accurately(con 
    precisión) 
    measure solar and lunar movements as well as(tanto 
    como) 
    eclipses. Hawkins used a computer to test his calculations and found 
    definite correlations between his figures and the solar and lunar positions 
    in 1500 BC (However(sin 
    embargo), as a result of the development of calibration curves 
    for radiocarbon dates, the main structure at the site, Stonehenge III, is 
    now believed to have been built(se 
    cree que fue construida en) 
    c.2000 BC)
 
 Some archaeologists object(se 
    oponen) 
    to Hawkins's theory on the basis that(basándose 
    en que) 
    the eclipse prediction system he proposed was much too(demasiado) 
    complex for the Early Bronze Age society of England. Most archaeologists 
    agree, however, that Stonehenge was used to observe the motions(movimientos) 
    of the moon as well as the sun. Research(investigaciones) 
    by the archaeologist Alexander Thom, based on the careful(cuidadoso) 
    mapping of hundreds of megalithic sites, indicates that the megalithic 
    ritual circles were built with a high degree(se 
    grado) 
    of accuracy(precisión), 
    requiring considerable mathematical and geometric sophistication.
 
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