Is Sun Declination based on location?
The position of any celestial object depends on the position of the observer on the Earth’s surface. This is known as diurnal parallax. It is more noticeable for close objects such as the Moon, which can appear to be displaced by up to one degree compared with its position seen by a hypothetical observer situated at the Earth’s centre. The position as seen from the centre of the Earth is known as the geocentric position, while the position as seen by an observer on the Earth’s surface is known as the topocentric position. The displacement of more distant objects by diurnal parallax can become quite small. Venus at its closest can be displaced by about 1 arcminute and for most planets, the displacement is of the order of arcseconds. The Sun’s maximum diurnal parallax is just under 9 arcseconds, so the Sun’s declination can vary by this amount, but this small figure is often neglected unless particular precision is needed. The diurnal parallax of stars is small enough to be neglected com
