First of all, A Happy Makara Sankranti to all of you and Best wishes for a happy and prosperous Makar Sankranti! Hope the Sun God fulfills all your wishes on this auspicious occasion.
The sun signifies knowledge, spiritual light and wisdom. Makar Sankranti signifies that we should turn away from the darkness of delusion in which we live, and begin to joyously let the light within us shine brighter and brighter. We should gradually begin to grow in purity, wisdom, and knowledge, even as the sun does from this day.
And at last, A video for you which is worth watching.