PURPORT

The time durations of day and night as well as of months and years are different in the different planets, stars and luminaries. The higher planets like the moon and Venus have different time measurements than the earth. It is said that six months of this planet earth is equal to one day of the higher planets. In Bhagavad-gita the duration of one day in Brahmaloka is measured to be 1,000 times the four yugas, or 4,300,000 multiplied by 1,000. And the month and year in Brahmaloka are calculated in that measure.