In plain words
The holy days of the people of Bhārata are days that proclaim the beauty of nature and the excellence of humanness. Today is the holy Sankrānti. Krānti means a change. That is, the sun's passing from one line to another. Each month the sun enters a new line. For the past thirty days the sun was on the line of Dhanus, so they named this the month of Dhanus. In this month of Dhanus women used to perform many auspicious rites. They used to keep many vratas. When the month of Dhanus ends, the Makara Saṅkramaṇa begins.
The sun is selfless, so men too must become selfless
The sun is selfless. His is a heart of equality. A feeling that holds oneness towards all. The sun has no rest at all. Without pause the sun carries out his work. The lesson Saṅkramaṇa teaches us is that we too, with the sun, should walk in the sun's footsteps. The sun is selfless. So men too must become selfless. The sun is free of Ahaṅkāra. He has not a trace of the Ahaṅkāra that says, "I am doing so much work". Without the sun there would be no life at all. It is the sun who makes nature beautiful in every way. It is through the sun that all creation, sustenance and dissolution take place. In the sun, who bears so great a responsibility, no Ahaṅkāra at all is seen. Such Ahaṅkāra belongs only to people of small minds who do small work. They say in the Telugu country: a leaf fully served with food lies low and quiet, it seems, and a leaf with nothing served on it flutters and jumps about! Does a full pot slop over? It does not. It is the empty vessels that slop. In the sun, who is full, no such petty feelings are seen at all. So every man too must become, like the sun, free of Ahaṅkāra. In the Veda it is said, "Candramā manaso jātaḥ, cakṣos sūryo ajāyataḥ, mukhād indraś ca …". They take it that the moon is our mind and the eyes are the sun.