Just in case you're not familiar, the Winter Solstice is on December 21st (the first day of winter). For reference, the Summer Solstice is on June 21st (the first day of summer).
Gestrid
2021-10-03 05:24:32 +0000 UTC
When you saw the days pass by in the temple. It was the dragon visualizing the days passing by for Aang. When the vision stopped, you can see that the light was already closing in on Roku’s forehead, so the Solstice is really close.
JovialGuy
2021-10-02 23:11:24 +0000 UTC
So, just a clarification, Spirits are (by large) not ghosts. Many spirits are manifestations of nature, They can be rather talented as well, manifesting in the physical world as creatures that exist there or as nightmarish versions of them. You will see more about it later as the series progresses. As for Iroh seeing Aang when he was astral projecting into the spirit world, that too will be touched upon later. For now, however, let's just say that he's a more well-rounded individual than most (no pun intended.)