Musar for Eruvin 111:7
אמר רב משרשיא ליתנהו להני כללי דתניא לא יצאה חמה מעולם מקרן מזרחית צפונית ושקעה בקרן מערבית צפונית ולא יצאה חמה מקרן מזרחית דרומית ושקעה בקרן מערבית דרומית
The direction in which on a short day the sun rises<span class="x" onmousemove="('comment',' At one end.');"><sup>11</sup></span> and sets<span class="x" onmousemove="('comment',' At the other end.');"><sup>12</sup></span> is the southern direction.<span class="x" onmousemove="('comment',' At the summer solstice the sun appears to rise in N.E. to move along E., S., and W. and to set N.W., thus rising and setting in the North. As the days shorten and the nights lengthen the circuit of the sun appears steadily to diminish and the points of sunrise and sunset appear to move day after day from N.E. to E. and from N.W. to W. respectively (the autumnal equinox, when days and nights are equal) and then to S.E. and S.W. respectively (the winter solstice when the days are shortest and the nights longest) . On the shortest day, therefore, the sun appears to rise in S.E., to move only along S., and to set in S.W., thus rising and setting in the South.');"><sup>14</sup></span>