Each year the Sun returns to the exact position it was at when you were born. This happens on or around your Birthday. This is where we get the common phrase 'Many Happy Returns'.
Although the Sun is at it's exact same position other things are different, the Sun's House may have changed and the other planets will also have changed positions. From this chart done at the seed of the new year we can determine what will be the main themes of the year. Is Venus in a prominent position, if so relationships will be highlighted, maybe Mars will indicate battles ahead. All is revealed in the chart for the coming year