They calculated the angle of the ecliptic and the precession of the equinoxes. [Please select]
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They approximated to the truth in reference to the solar year, by observing the equinoxes and solstices and the heliacal rising of particular stars. [Please select]
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The introduction of the gnomon (time-pillar) and dial into Greece advanced astronomical knowledge, since they were used to determine the equinoxes and solstices, as well as parts of the day. [Please select]
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