In which circles of the celestial sphere: large or small – does the Sun move in its diurnal movement on the days of the equinox and the days of the solstices?
On the days of the equinox, the diurnal parallel of the Sun coincides with the celestial equator, which is a large circle of the celestial sphere. On the days of the solstices, the diurnal parallel of the Sun is a small circle at a distance of 23.5 from the celestial equator.
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