original: The winter solstice occurs at the instant when the Sun's position in the sky is at its greatest angular distance on the other side of the equatorial plane from the observer's hemisphere.
simplifications: The winter solstice occurs at the instant when the Sun's position in the sky is at its greatest angular distance on the other side of the equatorial plane from the observer's half of the planet. The winter solstice happens when the Sun is at its lowest daily maximum height. Winter solstice is when the Sun's position in the sky is at its greatest distance on the other side of the equatorial plane. The winter solstice occurs when the sun's position in the sky is at its greatest height on the other side of the equator from where it's being observed. The winter solstice is when Sun's position in the sky is at its greatest angular distance on the other side of the equatorial plane from the observer's hemisphere. When the sun is furtherst from the oberver the winter solstic is occuring. The winter solstice is when the Sun is furthest away from the observer's hemisphere. The winter solstice occurs when the Sun is farthest from from the observer's hemisphere The winter solstice occurs when the Sun's position in the sky is at its greatest apparent distance. It is on the opposite side of the hemisphere that the person looking at it is on. The winter solstice occurs at the time when the  sun's position is at its  greatest angular distance from the viewer in the opposite hemisphere.