When Priyavrata drove his chariot behind the sun, the rims of his chariot
wheels created impressions that later became seven oceans, dividing the
planetary system known as Bhu-mandala into seven islands.
Sometimes the planets in outer space are called islands. We have
experience of various types of islands in the ocean, and similarly the various
planets, divided into fourteen lokas, are islands in the ocean of space. As
Priyavrata drove his chariot behind the sun, he created seven different types
of oceans and planetary systems, which altogether are known as Bhu-mandala,
or Bhuloka. In the Gayatri mantra, we chant, om bhur bhuvah svah tat savitur
varenyam. Above the Bhuloka planetary system is Bhuvarloka, and above that
is Svargaloka, the heavenly planetary system. All these planetary systems are
controlled by Savita, the sun-god. By chanting the Gayatri mantra just after
rising early in the morning, one worships the sun-god.
The names of the islands are Jambu, Plaksa, SAlmal…