अग्निर्ज्योतिरहः शुक्लः षण्मासा उत्तरायणम्।तत्र प्रयाता गच्छन्ति ब्रह्म ब्रह्मविदो जनाः॥
agnir jyotir ahaḥ śuklaḥ ṣaṇ-māsā uttarāyaṇamtatra prayātā gacchanti brahma brahma-vido janāḥ
Word by word
The verse says
Fire, light, day, the bright half of the month, the six months of the sun's northern course — those who depart then, knowing Brahman, go to Brahman.
In plain words
Every item on this list is something that shows you where you are.
Fire, light, daytime, the waxing moon, the half of the year when days grow longer.
Whether or not you take the calendar literally, the list is made entirely of visibility.
Where you've felt this · at work
Two people leave the same job in the same month. One finishes what she was doing, writes the notes up, hands over properly and says goodbye to everybody. The other stops replying and is simply gone one Monday. Both have left. Only one of them could ever walk back in.
Going deeper
Light is the common thread through every item, and that is the part of the passage that travels.
Read as calendar, this is a claim about auspicious times that most readers cannot test and will not act on. Read for what the images have in common, it says something plainer: what departs in clarity goes to clarity. Nothing here is mysterious except the packaging.
The great commentators divide on this, genuinely. Some hold the timing to be literal and consequential. Others take the bright path to describe the state of the person rather than the position of the sun, and point out that the chapter's closing instruction ignores timing altogether.
What both readings agree on is the direction of travel. You arrive in the condition you left in, and that condition is not decided at the door.